CN219107311U - Power supply circuit of energy storage system - Google Patents
Power supply circuit of energy storage system Download PDFInfo
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- CN219107311U CN219107311U CN202223262100.0U CN202223262100U CN219107311U CN 219107311 U CN219107311 U CN 219107311U CN 202223262100 U CN202223262100 U CN 202223262100U CN 219107311 U CN219107311 U CN 219107311U
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Abstract
The utility model discloses a power supply circuit of an energy storage system, which comprises an AC/DC voltage stabilizing converter and a DC/DC high-voltage to low-voltage converter, wherein the AC/DC voltage stabilizing converter is connected with an AC input end, and the DC/DC high-voltage to low-voltage converter is connected with a battery DC input end; the AC/DC voltage stabilizing converter and the DC/DC high-voltage to low-voltage converter are connected in parallel through a diode D1 and then connected to an output circuit. In the power supply circuit of the energy storage system, under the condition that alternating current is normal, the voltage output by the AC/DC voltage stabilizing converter directly supplies power for a following load; when the alternating current is abnormal or needs to be switched to direct current power supply, the AC/DC voltage stabilizing converter immediately stops outputting, and the output end of the battery DC/DC high-voltage to low-voltage converter passes through a diode D1 and then passes through a scram switch K1 to supply power to a load; the circuit has the main advantages that the unidirectional conduction characteristic of the diode is utilized, the defect that the capacitor of the AC/DC circuit has too long delay is overcome to about 150ms, the phenomenon of abnormal load power supply is easy to cause, and the switching time of the circuit is only about 3 ms.
Description
Technical Field
The utility model relates to the technical field of power supply circuits of energy storage systems, in particular to a power supply circuit of an energy storage system.
Background
Based on high voltage, high-power energy storage system power supply circuit, in the in-service use, because under the condition that the commercial power suddenly cuts off power, the AC/DC (alternating current-to-direct current voltage stabilizing circuit) is timely switched to DC/DC (high voltage direct current-to-low voltage direct current voltage stabilizing circuit) and is BMS, a relay and a fan power supply.
Because the AC/DC has capacitance characteristics in the actual use process, the output voltage is a trapezoid waveform at the moment of switching the AC/DC to the DC/DC, and the time is longer than 150 ms; at the moment of switching, voltage drop can not switch to DC/DC power supply in time and lead to BMS outage in the twinkling of an eye and can not normally work, and on the other hand, voltage drop can not switch to DC/DC power supply in time and also can lead to the relay work abnormal, leads to direct current contactor to draw the arc and strike sparks, generates heat, damages even.
Disclosure of Invention
The utility model aims to provide a power supply circuit of an energy storage system, which has the advantage of fast switching and solves the problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the energy storage system power supply circuit comprises an AC/DC voltage stabilizing converter and a DC/DC high-voltage to low-voltage converter, wherein the AC/DC voltage stabilizing converter is connected with an AC input end, and the DC/DC high-voltage to low-voltage converter is connected with a battery DC input end;
the DC/DC high-voltage to low-voltage converter is connected with the output of the AC/DC voltage stabilizing converter in parallel through a diode D1 and then is connected to an output circuit.
Preferably, the AC input end includes an AC380V input end and an S2 load isolation switch, three phase lines of the AC380V input end are respectively connected in series with the S2 load isolation switches a, b and c to the L1, L2 and L3 pins of the AC/DC voltage stabilizing converter 1, and a neutral line of the AC380V input end is connected in series with the S2 load isolation switch d to the FG pin of the AC/DC voltage stabilizing converter.
Preferably, the DC24V+ output from the AC/DC voltage stabilizing converter is connected to the scram switch K1, and the output D24V-is directly connected to the 24V-of the total output.
Preferably, the input end of the DC/DC high-voltage to low-voltage converter is a battery pack 300-450V output end, and the positive electrode and the negative electrode of the battery pack 300-450V output end are respectively connected with an S2 load isolating switch e and an S2 load isolating switch f in series and are connected with the DC+ pin and the DC pin of the DC/DC high-voltage to low-voltage converter.
Preferably, the output DC24V+ of the DC/DC high-voltage to low-voltage converter is connected to the scram switch K1 after passing through the diode D1, and the output DC 24V-of the DC/DC high-voltage to low-voltage converter is connected with the output DC 24V-of the voltage stabilizing converter and is connected to the total output 24V-.
The utility model is characterized in that:
the power supply circuit of the energy storage system utilizes the unidirectional conduction characteristic of the diode, and under normal conditions, the voltages output by the AC/DC converter and the DC/DC converter are equal, and the diode is not conducted. At this time, the AC/DC converter outputs preferentially to supply power to the load; when the alternating current is abnormal or the direct current power supply needs to be switched, the diode is conducted in the forward direction, so that the direct current/direct current converter is switched to output to supply power to a load. In the process of switching between DC/DC and AC/DC, the switching time of the circuit is only about 3 ms.
Drawings
Fig. 1 is a schematic diagram of the present utility model.
In the figure 1: an AC/DC voltage stabilizing converter, a 2, DC/DC high voltage to low voltage converter.
Detailed Description
The utility model will be described in detail below with reference to the accompanying drawings, which comprises an AC/DC voltage stabilizing converter 1 and a DC/DC high-voltage to low-voltage converter 2, wherein the AC/DC voltage stabilizing converter 1 is connected with an AC input end, and the DC/DC high-voltage to low-voltage converter 2 is connected with a battery DC output end;
the AC/DC voltage stabilizing converter 1 and the DC/DC high-voltage to low-voltage converter 2 are connected in parallel through a diode D1 and then connected to an output circuit.
The AC input end comprises an AC380V input end and an S2 load isolating switch, three phase lines of the AC380V input end are respectively connected with pins L1, L2 and L3 of the AC/DC voltage stabilizing converter 1 in series, and a neutral line of the AC380V input end is connected with a pin FG of the AC/DC voltage stabilizing converter 1 in series through an S2 load isolating switch d.
The DC24V+ output by the AC/DC voltage stabilizing converter 1 is connected to the scram switch K1, and the output D24V-is directly connected to the 24V-of the total output.
The input end of the DC/DC high-voltage to low-voltage converter 2 is the output end of the battery pack 300-450V, and the positive electrode and the negative electrode of the output end of the battery pack 300-450V are respectively connected with the S2 load isolating switches e and f in series and are connected with the DC+ pin and the DC-pin of the DC/DC high-voltage to low-voltage converter 2.
The DC/DC high-voltage to low-voltage converter 2 outputs DC24v+ which is connected to the scram switch K1 after passing through the diode D1. The output DC24V of the DC/DC high-voltage to low-voltage converter 2 is connected with the output DC24V of the voltage stabilizing converter 1, and is connected to the total output 24V-.
When the alternating current is normal, the voltages output by the AC/DC voltage stabilizing converter 1 and the DC/DC high-voltage to low-voltage converter 2 are equal, namely the voltages at two ends of the diodes are equal, the alternating current is not conducted, and the AC/DC voltage stabilizing converter 1 outputs preferentially to supply power;
when the alternating current is abnormal or needs to be switched to DC/DC power supply, the diode is conducted because the output voltage of the DC/DC converter 2 is higher than the voltage of the output end of the AC/DC voltage stabilizing converter 1, and the DC/DC high-voltage to low-voltage converter 2 outputs voltage power supply.
To sum up: according to the power supply circuit of the energy storage system, the diode is forward conducted only under the condition that the + end of the diode is larger than the-end of the diode by utilizing the unidirectional conduction characteristic of the diode. When the alternating current is normal, the diode is used for being not conducted, so that the AC/DC voltage stabilizing converter 1 outputs preferentially to supply power; when the alternating current is abnormal, the diode is conducted in the forward direction, and at the moment, the DC/DC high-voltage to low-voltage converter 2 outputs voltage to supply power.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (5)
1. The energy storage system power supply circuit comprises an AC/DC voltage stabilizing converter (1) and a DC/DC high-voltage to low-voltage converter (2), and is characterized in that: the AC/DC voltage stabilizing converter (1) is connected with an AC input end, and the DC/DC high-voltage to low-voltage converter (2) is connected with a battery DC input end; the output of the AC/DC voltage stabilizing converter (1) and the output of the DC/DC high-voltage to low-voltage converter (2) are connected in parallel through a diode D1 and then connected to an output circuit.
2. The energy storage system power supply circuit of claim 1, wherein: the AC input end comprises an AC380V input end and an S2 load isolating switch, three phase lines of the AC380V input end are respectively connected with pins L1, L2 and L3 of the AC/DC voltage stabilizing converter (1) in series, and a neutral line of the AC380V input end is connected with a pin FG of the AC/DC voltage stabilizing converter (1) in series by an S2 load isolating switch d.
3. The energy storage system power supply circuit of claim 1, wherein: the output DC24V+ of the AC/DC voltage stabilizing converter (1) is connected to the emergency stop switch K1, and the output D24V-is directly connected with the total output 24V-.
4. The energy storage system power supply circuit of claim 1, wherein: the input end of the DC/DC high-voltage to low-voltage converter (2) is connected with the output end of the battery pack 300-450V, the positive electrode and the negative electrode of the output end of the battery pack 300-450V are respectively connected with the S2 load isolating switches e and f in series, and the positive electrode and the negative electrode are connected with the DC+ pin and the DC-pin of the DC/DC high-voltage to low-voltage converter (2).
5. The energy storage system power supply circuit of claim 1, wherein: the DC/DC high-voltage to low-voltage converter (2) outputs DC24V+ which is connected to the scram switch K1 after passing through the diode D1, and the high-voltage to low-voltage converter (2) outputs DC 24V-which is connected with the voltage stabilizing converter (1) to output DC 24V-which is then connected to the total output 24V-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223262100.0U CN219107311U (en) | 2022-12-06 | 2022-12-06 | Power supply circuit of energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223262100.0U CN219107311U (en) | 2022-12-06 | 2022-12-06 | Power supply circuit of energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219107311U true CN219107311U (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223262100.0U Active CN219107311U (en) | 2022-12-06 | 2022-12-06 | Power supply circuit of energy storage system |
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| Country | Link |
|---|---|
| CN (1) | CN219107311U (en) |
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2022
- 2022-12-06 CN CN202223262100.0U patent/CN219107311U/en active Active
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