CN215734031U - Wave-chasing current-limiting energy-storage converter with hardware - Google Patents
Wave-chasing current-limiting energy-storage converter with hardware Download PDFInfo
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- CN215734031U CN215734031U CN202122351556.3U CN202122351556U CN215734031U CN 215734031 U CN215734031 U CN 215734031U CN 202122351556 U CN202122351556 U CN 202122351556U CN 215734031 U CN215734031 U CN 215734031U
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Abstract
The utility model relates to the technical field of electronic circuits, in particular to a wave-by-wave current-limiting energy-storage current transformer with hardware, which comprises: the direct current input terminal, the direct current input circuit breaker, the rectification contravariant unit, the filtering unit, output AC contactor, output AC circuit breaker, prevent surge protection unit, exchange output terminal. The output end of the direct current input wiring terminal is connected with the input end of the direct current input circuit breaker, and the output end of the direct current input circuit breaker is connected with the input end of the rectification inversion unit; the output end of the rectification inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the input end of the output alternating current contactor, the output end of the output alternating current contactor is connected with the input end of the output alternating current circuit breaker, and the output end of the output alternating current circuit breaker is connected with the input end of the anti-surge protection unit. The wave-by-wave current-limiting energy storage converter provided by the application not only meets the short-time high-power overload capacity of the energy storage converter, but also does not reduce the safety protection mechanism of a machine.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a wave-by-wave current-limiting energy-storage current transformer with hardware.
Background
The existing energy storage converter generally has an overcurrent protection function on hardware and software, and the overcurrent point cannot be too high due to the safety consideration of devices, so that the rated current cannot be exceeded too much. Therefore, when the machine is loaded with impact load, the machine overcurrent protection is easily triggered, so that the impact load with slightly larger power cannot operate. The starting power of motor loads of motors such as a water pump, a compressor and the like is 5-8 times of rated operation power, but the starting process is generally completed within hundreds of milliseconds, if the overcurrent point of an off-grid energy storage converter is designed to be low, the machine is subjected to overcurrent shutdown, and the load cannot work; if the overcurrent point is set too high, the protection mechanism of the machine is reduced, and the overcurrent damage of the power device is easily caused. There is a need to design a scheme which not only satisfies the short-time high-power overload capacity of the energy storage converter, but also does not reduce the safety protection mechanism of the machine.
SUMMERY OF THE UTILITY MODEL
The embodiment provides a wave-by-wave current-limiting energy storage converter with hardware, and aims to meet the short-time high-power overload capacity of the energy storage converter and not reduce the safety protection mechanism of a machine.
A wave-by-wave current-limiting energy storage converter with hardware comprises: the direct current input terminal, the direct current input circuit breaker, the rectification inversion unit, the filtering unit, the output alternating current contactor, the output alternating current circuit breaker, the anti-surge protection unit and the alternating current output terminal;
the output end of the direct current input wiring terminal is connected with the input end of the direct current input circuit breaker, and the output end of the direct current input circuit breaker is connected with the input end of the rectification inversion unit; the output end of the rectification inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the input end of the output alternating current contactor, the output end of the output alternating current contactor is connected with the input end of the output alternating current circuit breaker, and the output end of the output alternating current circuit breaker is connected with the input end of the anti-surge protection unit; and the output end of the anti-surge protection unit is connected with the alternating current output wiring end.
In one embodiment, the device further comprises a direct current voltage sampling circuit and a direct current sampling circuit;
the direct current voltage sampling circuit and the direct current sampling circuit are arranged on a line between the direct current input wiring terminal and the direct current input circuit breaker, and the direct current voltage sampling circuit and the direct current sampling circuit are respectively used for collecting input voltage values and current values.
In one embodiment, the direct current power supply further comprises an input direct current contactor, and the input direct current contactor is arranged on a line between the direct current input circuit breaker and the rectification inversion unit.
In one embodiment, the direct current power supply further comprises a bus supporting capacitor C1 and a first resistor R1, wherein the bus supporting capacitor C1 and the first resistor R1 are arranged on a line between the input direct current contactor and the rectification inverter unit;
two ends of the bus supporting capacitor C1 are respectively input into the positive electrode and the negative electrode of the output end of the direct current contactor to be connected; the first resistor R1 is connected in parallel across the bus supporting capacitor C1.
In one embodiment, the power supply further comprises an output inductor current sampling circuit, wherein the output inductor current sampling circuit comprises a current sampler and an inductor sampler, and the current sampler and the inductor sampler are arranged on a line between the rectification inverter unit and the filtering unit; the current sampler and the inductance sampler are respectively used for collecting a current value and an inductance value output by the rectification and inversion unit.
In one embodiment, the system further comprises an output alternating voltage sampling circuit, wherein the output alternating voltage sampling circuit is arranged on a line between the output alternating current contactor and the output alternating current breaker and is used for collecting a voltage value on the line.
In one embodiment, the protection circuit further comprises an alternating current output current sampling circuit, wherein the alternating current output current sampling circuit is arranged between the output alternating current breaker and the anti-surge protection unit and is used for acquiring a current value on the circuit.
In one embodiment, the intelligent power supply further comprises a main control unit, wherein the main control unit is connected with the direct current voltage sampling circuit, the direct current sampling circuit, the output inductive current sampling circuit, the output alternating current voltage sampling circuit, the alternating current output current sampling circuit, the input direct current contactor and the output alternating current contactor, and the main control unit is used for collecting collected voltage, current and inductive signals to process.
According to the embodiment, the energy storage converter with hardware wave-by-wave current limiting comprises: the direct current input terminal, the direct current input circuit breaker, the rectification contravariant unit, the filtering unit, output AC contactor, output AC circuit breaker, prevent surge protection unit, exchange output terminal. The output end of the direct current input wiring terminal is connected with the input end of the direct current input circuit breaker, and the output end of the direct current input circuit breaker is connected with the input end of the rectification inversion unit; the output end of the rectification inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the input end of the output alternating current contactor, the output end of the output alternating current contactor is connected with the input end of the output alternating current circuit breaker, and the output end of the output alternating current circuit breaker is connected with the input end of the anti-surge protection unit; the output end of the anti-surge protection unit is connected with the alternating current output wiring end. The wave-by-wave current-limiting energy storage converter provided by the application not only meets the short-time high-power overload capacity of the energy storage converter, but also does not reduce the safety protection mechanism of a machine.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a converter according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a partial structure of a current transformer according to an embodiment of the present application;
FIG. 3 is a partial structural diagram of a current transformer according to an embodiment of the present application;
FIG. 4 is a partial structural diagram of a current transformer according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an optimized part of a main control unit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a main control unit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a wave-by-wave current-limiting energy-storing converter with hardware, which includes: the direct current input circuit breaker comprises a direct current input wiring terminal 1, a direct current input circuit breaker 4, a rectification inverter unit 7, a filtering unit 9, an output alternating current contactor 10, an output alternating current circuit breaker 12, an anti-surge protection unit 14 and an alternating current output wiring 15. The output end of the direct current input wiring terminal 1 is connected with the input end of a direct current input circuit breaker 4, and the output end of the direct current input circuit breaker 4 is connected with the input end of a rectification inverter unit 7; the output end of the rectification inversion unit 7 is connected with the input end of the filter unit 9, the output end of the filter unit 9 is connected with the input end of the output alternating current contactor 10, the output end of the output alternating current contactor 10 is connected with the input end of the output alternating current breaker 12, and the output end of the output alternating current breaker 12 is connected with the input end of the anti-surge protection 14; the output terminal of the surge protection unit 14 is connected to an ac output terminal 15.
In one embodiment, the current-limiting energy-storage converter with hardware wave-by-wave current of the embodiment further comprises a direct-current voltage sampling circuit 2 (such as U-DC in fig. 2) and a direct-current sampling circuit 3(l 1-DC). The direct current voltage sampling circuit 2 and the direct current sampling circuit 3 are both arranged on a line between the direct current input wiring terminal 1 and the direct current input circuit breaker 4, and the direct current voltage sampling circuit 2 and the direct current sampling circuit 3 are respectively used for collecting input voltage values and current values.
In an embodiment, the energy storage converter with hardware wave-by-wave current limiting of this embodiment further includes an input dc contactor 5, and the input dc contactor 5 is disposed on a line between the dc input breaker 4 and the rectification and inversion unit 7. The direct current input breaker 4 of the embodiment is shown as QF2 in FIG. 2, the input direct current contactor 5 is shown as KM2 in FIG. 2, the control signal end is KM2-CON, which comprises R2 and KM2, KM2 is connected in series in a main line, and R2 is connected in parallel at two ends of KM 2.
In an embodiment, the wave-by-wave current-limiting energy-storage converter with hardware of this embodiment further includes a bus supporting capacitor C1 and a first resistor R1, where the bus supporting capacitor C1 and the first resistor R1 are both disposed on a line between the input dc contactor and the rectifying and inverting unit. Two ends of the bus supporting capacitor C1 are respectively input into the positive electrode and the negative electrode of the output end of the direct current contactor to be connected; the first resistor R1 is connected in parallel across the bus support capacitor C1.
In an embodiment, the current-limiting energy-storage converter with hardware wave-by-wave current limiting of this embodiment further includes an output inductor current sampling circuit 8, where the inductor current sampling circuit 8 includes a current sampler and an inductor sampler, and the current sampler and the inductor sampler are disposed on a line between the rectification inverting unit and the filtering unit; the current sampler and the inductance sampler are respectively used for collecting a current value and an inductance value output by the rectifying and inverting unit, for example, the inductance sampler in fig. 3 includes la-L1, lb-L1, and lc-L1, the current sampler includes TA4, TA5, and TA6, which are denoted as TA4-TA6 in fig. 3 for simplicity.
In an embodiment, the energy storage converter with hardware wave-by-wave current limiting of this embodiment further includes an output ac voltage sampling circuit 11, where the output ac voltage sampling circuit 11 is disposed on a line between the output ac contactor 10 and the output ac circuit breaker 12, and the output ac voltage sampling circuit 11 is configured to collect a voltage value on the line. Referring to fig. 3, the output ac contactor 10 of this embodiment is KM1, and the control terminal of the ac contactor 10 is KM1 is KM 1-CON; the output AC voltage sampling circuit 11 is shown as U-A, U-B and U-C in FIG. 4; the output ac circuit breaker 12 of the present embodiment is QF1 in fig. 4.
In an embodiment, the wave-by-wave current-limiting energy-storage converter with hardware of this embodiment further includes an ac output current sampling circuit 13, where the ac output current sampling circuit 13 is disposed on a line between the output ac circuit breaker 12 and the anti-surge protection unit 14, the ac output current sampling circuit 13 is configured to acquire a current value of the circuit, such as TA1, TA2, and TA3 in fig. 4, which are shown as TA1-TA3 in fig. 4 for simplicity, and TA1-TA3 are respectively disposed on the A, B, C three-phase circuit to acquire current information, and signal output terminals of the three current sensors TA1-TA3 are la-out, lb-out, and lc-out, respectively.
As shown in fig. 4, the anti-surge protection unit of this embodiment is F1, the dc input connection terminal 1 of this embodiment is a dc input connection copper bar, and the ac output connection terminal 15 is an ac output connection copper bar.
The filtering unit 9 of the present embodiment includes L1, L2, L3, L4, L5, and L6, and C2 formed by three capacitors, which are connected in a star shape.
In an embodiment, the current-limiting energy-storage converter with hardware wave-by-wave current-limiting function further includes a main control unit, the main control unit is connected to the acquisition end of the dc voltage sampling circuit 2, the acquisition end of the dc current sampling circuit 3, the acquisition end of the output inductive current sampling circuit 8, the acquisition end of the output ac voltage sampling circuit 11, the acquisition end of the ac output current sampling circuit 13, the control end of the input dc contactor 5, and the control end of the output ac contactor 10, and the main control unit is configured to collect the collected voltage, current, and inductive signals for processing, and control the contactors and other circuit units to operate simultaneously.
As shown in fig. 5 and fig. 6, the main control unit is mainly optimally designed in this embodiment, a specific circuit diagram is as shown in fig. 5, fig. 5 is a scheme of a one-phase wave-by-wave current limiting circuit in a three-phase circuit, and circuits of other two phases are the same as those in fig. 5, and are not described herein again. In FIG. 5, Ia-L1 is an AC inductive sampling current signal, -REF1/+ REF1 is a trigger wave-chasing current-limiting set point, PWM-U + and PWM-U-are A-phase half-bridge up-and-down tube drives, CLOCK is a square wave signal with a 2.4KHZ duty ratio of 25% output by a CLOCK chip NA555, when the output real-time inductive current Ia-L1 exceeds a set current-limiting point-REF 1/+ REF1, the A-phase half-bridge up-and-down tube drives PWM-U + and PWM-U-are pulled down forcibly when overcurrent occurs, and the level is kept low until no overcurrent occurs when rising edges of the CLOCK square wave signal are detected, the drives PWM-U + and PWM-U-are recovered to be normal, so that the function of real-time current-limiting output is achieved. Through experimental tests, the wave-by-wave current-limiting energy storage converter can carry a larger-capacity motor impact load, and the stability of the output load of the system is greatly enhanced.
The working process of the energy storage converter in the embodiment is as follows: the direct current of the battery can be connected to the direct current input connecting terminal 1 through wiring, and the alternating current load can be connected through the alternating current output connecting terminal 15; the direct current input circuit breaker 4 and the output alternating current circuit breaker 12 can respectively play a role in tripping protection during direct current and alternating current short circuit; when the converter is started to work, the main control unit controls the input direct current contactor 5 and the output alternating current contactor 10 to be attracted, the direct current voltage sampling circuit 2 samples the voltage of an input battery, the direct current sampling circuit 3 samples the charging and discharging current of the input battery in real time, the output inductive current sampling circuit 8 samples the output alternating current inductive current in real time, the output alternating current voltage sampling circuit 11 and the output alternating current voltage sampling circuit 11 respectively sample the alternating current output voltage and the alternating current in real time, all sampling data are connected to the main control unit 16, the main control unit processes the data and controls the output, the output algorithm controls the rectification inversion unit 7 to charge or discharge the battery with load; the bus supporting capacitor C1 mainly plays a role in supporting direct current input, energy high-frequency charging and discharging are carried out when the rectifying and inverting unit 7 is switched on and switched off, the filtering unit 9 carries out filtering processing on output to output stable sinusoidal voltage, and the surge protection unit 14 mainly prevents transient impact voltage from causing overvoltage damage to system devices. The present invention has been described in terms of specific examples, which are provided to aid understanding of the utility model and are not intended to be limiting. For a person skilled in the art to which the utility model pertains, several simple deductions, modifications or substitutions may be made according to the idea of the utility model.
Claims (8)
1. A wave current-limiting energy-storing converter with hardware is characterized by comprising: the direct current input terminal, the direct current input circuit breaker, the rectification inversion unit, the filtering unit, the output alternating current contactor, the output alternating current circuit breaker, the anti-surge protection unit and the alternating current output terminal;
the output end of the direct current input wiring terminal is connected with the input end of the direct current input circuit breaker, and the output end of the direct current input circuit breaker is connected with the input end of the rectification inversion unit; the output end of the rectification inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the input end of the output alternating current contactor, the output end of the output alternating current contactor is connected with the input end of the output alternating current circuit breaker, and the output end of the output alternating current circuit breaker is connected with the input end of the anti-surge protection unit; and the output end of the anti-surge protection unit is connected with the alternating current output wiring end.
2. The wave-by-wave current-limiting energy-storing current transformer with hardware of claim 1, further comprising a direct-current voltage sampling circuit and a direct-current sampling circuit;
the direct current voltage sampling circuit and the direct current sampling circuit are arranged on a line between the direct current input wiring terminal and the direct current input circuit breaker, and the direct current voltage sampling circuit and the direct current sampling circuit are respectively used for collecting input voltage values and current values.
3. The wave-by-wave current-limiting energy storage converter with hardware of claim 2, further comprising an input dc contactor disposed on a line between the dc input breaker and the rectifying and inverting unit.
4. The wave-by-wave current-limiting energy storage converter with hardware of claim 3, further comprising a bus supporting capacitor C1 and a first resistor R1, wherein the bus supporting capacitor C1 and the first resistor R1 are both arranged on a line between the input DC contactor and the rectification inverter unit;
two ends of the bus supporting capacitor C1 are respectively input into the positive electrode and the negative electrode of the output end of the direct current contactor to be connected; the first resistor R1 is connected in parallel across the bus supporting capacitor C1.
5. The wave-by-wave current-limiting energy-storage current transformer with hardware according to claim 4, further comprising an output inductor current sampling circuit, wherein the output inductor current sampling circuit comprises a current sampler and an inductor sampler, and the current sampler and the inductor sampler are arranged on a line between the rectification inversion unit and the filtering unit; the current sampler and the inductance sampler are respectively used for collecting a current value and an inductance value output by the rectification and inversion unit.
6. The wave-by-wave current-limiting energy storage converter with hardware of claim 5, further comprising an output AC voltage sampling circuit disposed on a line between the output AC contactor and the output AC circuit breaker for collecting a voltage value on the line.
7. The wave-by-wave current-limiting energy storage converter with hardware of claim 6, further comprising an ac output current sampling circuit disposed between the output ac circuit breaker and the anti-surge protection unit for collecting a current value on the circuit.
8. The current-limiting power converter according to claim 7, further comprising a main control unit, wherein the main control unit is connected to the dc voltage sampling circuit, the dc current sampling circuit, the output inductor current sampling circuit, the output ac voltage sampling circuit, the ac output current sampling circuit, the input dc contactor, and the output ac contactor, and is configured to collect the collected voltage, current, and inductor signals for processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122351556.3U CN215734031U (en) | 2021-09-27 | 2021-09-27 | Wave-chasing current-limiting energy-storage converter with hardware |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122351556.3U CN215734031U (en) | 2021-09-27 | 2021-09-27 | Wave-chasing current-limiting energy-storage converter with hardware |
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| Publication Number | Publication Date |
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| CN215734031U true CN215734031U (en) | 2022-02-01 |
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| CN202122351556.3U Active CN215734031U (en) | 2021-09-27 | 2021-09-27 | Wave-chasing current-limiting energy-storage converter with hardware |
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- 2021-09-27 CN CN202122351556.3U patent/CN215734031U/en active Active
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