Communication signal level conversion circuit and distributed energy storage system

Abstract

The utility model discloses a communication signal level conversion circuit and a distributed energy storage system, and relates to the technical field of communication systems. The communication signal level conversion circuit is connected between a micro-control unit and at least one communication transceiver, and comprises a bidirectional level conversion chip and a unidirectional level conversion chip. An enable signal output by the micro-control unit is subjected to level conversion through the one-way level conversion chip and then is sent to the communication transceiver, and a sending signal output by the micro-control unit is subjected to level conversion through the two-way level conversion chip and then is sent to the communication transceiver. Receiving signals output by the communication transceiver are transmitted to the micro-control unit after being subjected to level conversion through the bidirectional level conversion chip. According to the technical scheme disclosed by the utility model, under the condition of lower hardware cost, the problem of voltage division generated when the enable signal sent by the micro-control unit to the communication transceiver passes through the bidirectional level conversion chip is solved, and the communication reliability of the communication transceiver is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of communication systems, in particular to a level conversion circuit of communication signals and a distributed energy storage system. Background Art

[0002] With the vigorous development of the new energy and energy storage industries, it has become increasingly important to improve the communication reliability of distributed energy storage products. When existing distributed energy storage products are communicating, the enable signal output by the microcontroller unit (MCU) of the distributed energy storage product and system is sent to the communication transceiver after being converted by a bidirectional level conversion chip (for example, converting a 3.3V enable signal to a 5V enable signal) so that the communication transceiver can enter the working state; further, the transmit (transport, TX) signal output by the MCU is sent to the signal receiving end of the communication transceiver after being converted by a bidirectional level conversion chip (for example, converting a 3.3V transmit signal to a 5V transmit signal), and the receive (receive, RX) signal output by the communication transceiver is sent to the communication signal receiving end of the MCU after being converted by a bidirectional level conversion chip (for example, converting a 5V receive signal to a 3.3V receive signal) to complete the communication process of the distributed energy storage product.

[0003] However, the internal circuit of the existing bidirectional level conversion chip has an internal resistance of 300 ohms to 500 ohms, which will affect the effect of level conversion when performing level conversion on signals in a specific direction; at the same time, in order to make the enable function of the communication transceiver work reliably and stably when receiving the enable signal sent by the MCU, a pull-down resistor is often added to the enable terminal of the communication transceiver. Because of the above situation, the enable signal sent by the MCU is divided by the above internal resistance and the pull-down resistor, and the high level of the enable signal is seriously reduced, which seriously affects the communication reliability of distributed energy storage products. Utility Model Content

[0004] In view of this, the utility model provides a level conversion circuit for communication signals and a distributed energy storage system, the main purpose of which is to solve the technical problem of low communication reliability of distributed energy storage products.

[0005] To achieve the above object, the utility model first provides a communication signal level conversion circuit, which is connected between a micro control unit and at least one communication transceiver, and the communication signal level conversion circuit includes a bidirectional level conversion chip and a unidirectional level conversion chip;

[0006] The enable signal receiving end of the unidirectional level conversion chip is connected to the enable signal output end of the micro control unit, the enable signal output end of the unidirectional level conversion chip is connected to the enable end of the communication transceiver, and the unidirectional level conversion chip is used to perform level conversion on the enable signal sent by the micro control unit;

[0007] The first signal receiving end of the bidirectional level conversion chip is connected to the communication signal output end of the micro control unit, the first signal output end of the bidirectional level conversion chip is connected to the signal receiving end of the communication transceiver, and the bidirectional level conversion chip is used to perform level conversion on the sending signal sent by the micro control unit;

[0008] The second signal receiving end of the bidirectional level conversion chip is connected to the signal output end of the communication transceiver, and the second signal output end of the bidirectional level conversion chip is connected to the communication signal receiving end of the micro control unit. The bidirectional level conversion chip is also used to perform level conversion on the received signal sent by the communication transceiver.

[0009] In one embodiment of the utility model, the enable end of the communication transceiver includes a signal receiving enable end and a signal sending enable end, and the enable signal output end of the unidirectional level conversion chip is simultaneously connected to the signal receiving enable end and the signal sending enable end of the communication transceiver.

[0010] In one embodiment of the utility model, the level conversion circuit of the communication signal also includes a voltage comparator and a level monitor; the in-phase access end of the voltage comparator is connected to the enable signal output end of the unidirectional level conversion chip, and the inverting access end of the voltage comparator is connected to the enable signal receiving end of the unidirectional level conversion chip; the signal receiving end of the level monitor is connected to the output end of the voltage comparator, and the level monitor is used to issue an alarm prompt message when a low level signal is received from the voltage comparator.

[0011] In one embodiment of the utility model, the level monitor includes an alarm controller and an audible and visual alarm; the signal receiving end of the alarm controller is connected to the output end of the voltage comparator, and the alarm controller is used to control the audible and visual alarm to issue an alarm prompt message when a low level signal is received from the voltage comparator.

[0012] In one embodiment of the utility model, the sound and light alarm is a sound and light lamp or a buzzer.

[0013] In one embodiment of the utility model, the level conversion circuit of the communication signal also includes a first power supply and a second power supply; the first power supply is respectively connected to the first power access terminal of the unidirectional level conversion chip and the first power access terminal of the bidirectional level conversion chip, and is used to provide a first working voltage of a first preset voltage level for the unidirectional level conversion chip and the bidirectional level conversion chip; the second power supply is respectively connected to the second power access terminal of the unidirectional level conversion chip and the second power access terminal of the bidirectional level conversion chip, and is used to provide a second working voltage of a second preset voltage level for the unidirectional level conversion chip and the bidirectional level conversion chip.

[0014] In addition, to achieve the above objectives, the present invention also proposes a distributed energy storage system, which includes a micro control unit, at least one communication transceiver, and a level conversion circuit for the communication signal as described above.

[0015] In one embodiment of the utility model, the distributed energy storage system also includes a transceiver power supply circuit; the transceiver power supply circuit includes at least one capacitor connected in parallel; the connection end after the first end of each capacitor is connected in parallel is respectively connected to an external power supply and a power supply end of the communication transceiver; the connection end after the second end of each capacitor is connected in parallel is grounded.

[0016] In one embodiment of the present invention, the communication transceiver is an RS485 communication transceiver.

[0017] In one embodiment of the present invention, the communication transceiver is an RS232 communication transceiver.

[0018] The utility model provides a level conversion circuit and distributed energy storage system for communication signals, which can enable the enable signal output by the microcontroller unit to be sent to the communication transceiver after being level-converted by a unidirectional level conversion chip, wherein the existing unidirectional level conversion chip has an extremely small internal resistance in the direction of signal transmission due to the internal circuit, and will not cause voltage division to the enable signal; further, the transmission signal output by the microcontroller unit is sent to the communication transceiver after being level-converted by a bidirectional level conversion chip, and the receiving signal output by the communication transceiver is sent to the microcontroller unit after being level-converted by a bidirectional level conversion chip. The technical solution of the present application prevents the enable signal sent from the MCU to the communication transceiver from being excessively divided when being level-converted by the unidirectional level conversion chip, and can effectively avoid the voltage division problem caused by the enable signal sent by the microcontroller unit to the communication transceiver when passing through the bidirectional level conversion chip with less hardware cost, thereby improving the signal quality of the enable signal and thus enhancing the communication reliability of the communication transceiver.

[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 One of the structural schematic diagrams of a level conversion circuit for a communication signal provided by an embodiment of the utility model is shown;

[0022] Figure 2 A schematic structural diagram of a level conversion circuit for a communication signal provided by an example of an embodiment of the utility model is shown;

[0023] Figure 3 A second structural schematic diagram of a level conversion circuit for a communication signal provided by an embodiment of the utility model is shown;

[0024] Figure 4 A schematic diagram showing the connection between a voltage comparator, a level monitor and a unidirectional level conversion chip provided by an embodiment of the utility model is shown;

[0025] Figure 5 A third structural schematic diagram of a level conversion circuit for a communication signal provided by an embodiment of the utility model is shown;

[0026] Figure 6 A structural schematic diagram of a distributed energy storage system provided by an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0028] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation methods, structures, features and effects of the utility model application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0029] Combine the following Figures 1 to 6 A communication signal level conversion circuit and a distributed energy storage system according to some embodiments of the present invention are described.

[0030] like Figure 1 As shown, a level conversion circuit for a communication signal proposed in an embodiment of the utility model is connected between a microcontroller unit 100 and at least one communication transceiver 400, wherein the microcontroller unit (MCU) can be a control unit in a distributed energy storage system or a product, and the communication transceiver 400 can be a signal receiving and sending device such as an RS485 transceiver, an RS232 transceiver, etc.

[0031] Furthermore, the level conversion circuit of the communication signal includes a bidirectional level conversion chip 300 and a unidirectional level conversion chip 200 .

[0032] Specifically, the enable signal receiving end of the unidirectional level conversion chip 200 is connected to the enable signal output end of the micro control unit 100, and the enable signal output end of the unidirectional level conversion chip 200 is connected to the enable end of the communication transceiver 400. The unidirectional level conversion chip 200 is used to perform level conversion on the enable signal sent by the micro control unit 100 to the communication transceiver 400.

[0033] Furthermore, the first signal receiving end of the bidirectional level conversion chip 300 is connected to the communication signal output end of the micro control unit 100, and the first signal output end of the bidirectional level conversion chip 300 is connected to the signal receiving end of the communication transceiver 400. The bidirectional level conversion chip 300 is used to perform level conversion on the transmission signal (TX signal) sent by the micro control unit 100 to the communication transceiver 400.

[0034] Furthermore, the second signal receiving end of the bidirectional level conversion chip 300 is connected to the signal output end of the communication transceiver 400, and the second signal output end of the bidirectional level conversion chip 300 is connected to the communication signal receiving end of the micro control unit 100. The bidirectional level conversion chip 300 is also used to perform level conversion on the receiving signal (RX signal) sent by the communication transceiver 400 to the micro control unit 100.

[0035] Furthermore, the unidirectional level conversion chip may be connected to multiple communication transceivers, for example, Figure 2As shown, the number of communication transceivers is 2, including a first communication transceiver and a second communication transceiver; the unidirectional level conversion chip 200 receives the first enable signal EN11 issued by the micro control unit 100 through an enable signal receiving end, and performs level conversion on the first enable signal EN11, such as converting the 3.3V first enable signal EN11 into a 5V second enable signal EN21, and sending the second enable signal EN21 to the enable end of the first communication transceiver through an enable signal output end of the unidirectional level conversion chip 200; further, the unidirectional level conversion chip 200 receives the third enable signal EN12 issued by the micro control unit 100 through another enable signal receiving end, and performs level conversion on the third enable signal EN12, such as converting the 3.3V third enable signal EN12 into a 5V fourth enable signal EN22, and sending the fourth enable signal EN22 to the enable end of the second communication transceiver through another enable signal output end of the unidirectional level conversion chip 200. Here, Figure 2 In the embodiment, the number of communication transceivers connected to the unidirectional level conversion chip 200 is two as an example for description, and other numbers of communication transceivers are also applicable to this embodiment.

[0036] Furthermore, the bidirectional level conversion chip may be connected to multiple communication transceivers, for example, Figure 2 As shown, the number of communication transceivers is 2, including a first communication transceiver and a second communication transceiver; the bidirectional level conversion chip 300 receives a 3.3V first TX signal TX11 emitted by the microcontroller unit 100 through a first signal receiving end, and converts the first TX signal TX11 into a 5V second TX signal TX21, and sends the second TX signal TX21 to the signal receiving end of the first communication transceiver through a first signal output end of the bidirectional level conversion chip 300; further, the bidirectional level conversion chip 300 receives a 3.3V third TX signal TX12 emitted by the microcontroller unit 100 through another first signal receiving end, and performs level conversion on the 3.3V third TX signal TX12 to obtain a 5V fourth TX signal TX22, and sends the fourth TX signal TX22 to the signal receiving end of the second communication transceiver through another first signal output end of the bidirectional level conversion chip 300. Here, Figure 2 In the embodiment, the number of communication transceivers connected to the bidirectional level conversion chip 300 is two as an example for description, and other numbers of communication transceivers are also applicable to this embodiment.

[0037] Further, the bidirectional level conversion chip 300 receives the 5V first RX signal RX11 sent by the first communication transceiver through a second signal receiving end, and converts the first RX signal RX11 into a 3.3V second RX signal RX21, and sends the second RX signal RX21 to the communication signal receiving end of the micro control unit 100 through a second signal output end of the bidirectional level conversion chip; further, the bidirectional level conversion chip 300 receives the 5V third RX signal RX12 sent by the second communication transceiver through another second signal receiving end, and converts the third RX signal RX12 into a 3.3V fourth RX signal RX22, and sends the fourth RX signal RX22 to the communication signal receiving end of the micro control unit 100 through another second signal output end of the bidirectional level conversion chip 300. Here, Figure 2 In the embodiment, the number of communication transceivers connected to the bidirectional level conversion chip 300 is two as an example for description, and other numbers of communication transceivers are also applicable to this embodiment.

[0038] The level conversion circuit of the communication signal proposed in the embodiment of the utility model can make the enable signal output by the microcontroller unit be sent to the communication transceiver after being level-converted by the unidirectional level conversion chip, wherein the existing unidirectional level conversion chip does not cause voltage division to the enable signal because the internal circuit no longer has the internal resistance of the bidirectional level conversion chip; further, the sending signal output by the microcontroller unit is sent to the communication transceiver after being level-converted by the bidirectional level conversion chip, and the receiving signal output by the communication transceiver is sent to the microcontroller unit after being level-converted by the bidirectional level conversion chip. The technical solution of the present application prevents the enable signal sent from the MCU to the communication transceiver from being excessively divided when being level-converted by the unidirectional level conversion chip, and can avoid the voltage division problem caused by the enable signal sent by the microcontroller unit to the communication transceiver when passing through the bidirectional level conversion chip with less hardware cost, thereby improving the signal quality of the enable signal and thus enhancing the communication reliability of the communication transceiver.

[0039] In one embodiment, Figure 3 As shown, the enabling end of the communication transceiver includes a signal receiving enabling end and the signal transmission enable terminal DE, the enable signal output terminal of the unidirectional level conversion chip 200 is simultaneously connected to the signal receiving enable terminal of the communication transceiver 400 and the signal transmission enable terminal DE is connected, that is, an enable signal output terminal of the unidirectional level conversion chip 200 is connected to a signal receiving enable terminal of a communication transceiver 400 And the signal transmission enable terminal DE. Among them, when the signal reception enable terminal of the communication transceiver 400 When receiving a low level signal, the communication transceiver 400 enters the signal receiving state, can receive a signal from the outside as a receiving signal (RX signal), and send the receiving signal to the micro control unit 100 via the bidirectional level conversion chip 300; Conversely, when the signal receiving enable terminal of the communication transceiver 400 is When a high level signal, such as a 5V enable signal, is received, the communication transceiver 400 exits the signal receiving state and cannot receive signals from the outside world. Further, when the signal transmission enable end DE of the communication transceiver 400 receives a high level signal, the communication transceiver 400 enters the signal transmission state, and can obtain a signal from the microcontroller unit 100 as a transmission signal (TX signal) via the bidirectional level conversion chip 300, and send the transmission signal to the outside world; relatively, when the signal transmission enable end DE of the communication transceiver 400 receives a low level signal, the communication transceiver 400 exits the signal transmission state and cannot send signals to the outside world. The embodiment provided by the present application enables the MCU to control whether the communication transceiver can send or receive signals through the unidirectional level conversion chip of the level conversion circuit of the communication signal, thereby improving the control ability of the communication transceiver.

[0040] In one embodiment, Figure 4 As shown, the level conversion circuit of the communication signal further includes a voltage comparator 500 and a level monitor 600 .

[0041] Specifically, the in-phase access end of the voltage comparator 500 is connected to the enable signal output end of the unidirectional level conversion chip 200, and the inverting access end of the voltage comparator 500 is connected to the enable signal receiving end of the unidirectional level conversion chip 200; here, if the unidirectional level conversion chip 200 is connected to multiple communication transceivers 400, the number of voltage comparators 500 in the level conversion circuit of the communication signal is equal to the number of communication transceivers 400. The enable signal receiving end and the enable signal output end of the unidirectional level conversion chip 200 through which the enable signal output by the micro control unit 100 passes are used as a pair of terminal pairs, and the enable signal output end of each terminal pair is connected to the in-phase access end of a specific voltage comparator 500, and the enable signal receiving end in the terminal pair is connected to the inverting access end of the voltage comparator 500.

[0042] Further, when the voltage of the enable signal receiving end in the terminal pair is greater than the voltage of the enable signal output end, the voltage comparator 500 outputs a low level signal. Further, the signal receiving end of the level monitor 600 is connected to the output end of the voltage comparator 500, and the level monitor 600 is used to issue an alarm prompt message when receiving a low level signal from the voltage comparator 500. For example, if the voltage at the enable signal receiving end of the unidirectional level conversion chip 200 is 3.3V and the voltage at the enable signal output end of the unidirectional level conversion chip 200 is 2V, the voltage comparator 500 outputs a low level signal to the level monitor 600. Conversely, if the voltage at the enable signal receiving end of the unidirectional level conversion chip 200 is 3.3V and the voltage at the enable signal output end of the unidirectional level conversion chip 200 is 5V, the voltage comparator 500 outputs a high level signal to the level monitor 600. Here, the level monitor 600 may be a computer device such as a monitoring terminal in a remote control room, connected to all voltage comparators 500. In the embodiment provided by the present application, when the level monitor receives a low level signal sent by the voltage comparator, it can be determined that the enable signal corresponding to the voltage comparator is divided, and the voltage of the enable signal is too low. At this time, the relevant staff can be informed of the situation that the enable signal is too low, and further processing can be performed.

[0043] In one embodiment, the level monitor includes an alarm controller and an audible and visual alarm; specifically, the signal receiving end of the alarm controller is connected to the output end of the voltage comparator, and the alarm controller is used to control the audible and visual alarm to send out an alarm prompt message when a low-level signal is received from the voltage comparator. Here, the alarm controller can be a single-chip microcomputer or a digital signal processor, which is provided with a preset alarm program. When the alarm controller receives a low-level signal from the voltage comparator, the audible and visual alarm connected to the alarm controller is controlled to send out an alarm prompt message. Further, the audible and visual alarm can be an audible and visual lamp or a buzzer, and the audible and visual alarm can be set in a remote monitoring room so that relevant staff can be informed of abnormal conditions within the first time when the audible and visual alarm sends out an alarm. The embodiment provided by the present application can send out an alarm prompt message based on the audible and visual alarm, so that relevant staff can be informed of abnormal conditions in a timely manner and perform corresponding processing, thereby improving the abnormal response capability of the level conversion circuit of the communication signal.

[0044] In one embodiment, Figure 5 As shown, the level conversion circuit of the communication signal further includes a first power supply E1 and a second power supply E2.

[0045] Specifically, the first power supply E1 is respectively connected to the first power access terminal of the unidirectional level conversion chip 200 and the first power access terminal of the bidirectional level conversion chip 300, and is used to provide a first working voltage of a first preset voltage level for the unidirectional level conversion chip 200 and the bidirectional level conversion chip 300; here, if the voltage level output by the enable signal output by the micro control unit 100 is 3.3V, the first power supply E1 can be used to output a voltage of 3.3V, and the value of the first preset voltage level can be determined according to actual conditions.

[0046] Furthermore, the second power supply E2 is respectively connected to the second power supply access terminal of the unidirectional level conversion chip 200 and the second power supply access terminal of the bidirectional level conversion chip 300, and is used to provide the second working voltage of the second preset voltage level for the unidirectional level conversion chip 200 and the bidirectional level conversion chip 300. Here, if the communication transceiver 400 needs to receive an enable signal with a voltage level of 5V, the second power supply E2 can be used to output a voltage of 5V, and the value of the second preset voltage level can be determined according to actual conditions. The embodiment provided by the present application can power the unidirectional level conversion chip and the bidirectional level conversion chip based on the first power supply and the second power supply, thereby improving the power supply stability of the level conversion circuit of the communication signal.

[0047] It should be noted that the selection of the level monitor, voltage comparator, sound and light alarm, unidirectional level conversion chip, bidirectional level conversion chip and the internal circuit connection mode of the alarm controller can be determined according to the actual situation, and this embodiment does not make specific restrictions. In addition, the connection mode of each device can be determined according to the specific selection of the device, and this embodiment does not make specific restrictions. The circuit function of the level conversion circuit of the communication signal provided in this embodiment is mainly realized through the circuit connection relationship between each circuit module, and does not rely on the program module in a certain circuit module. In addition, each circuit module in the level conversion circuit of the communication signal can be realized by an analog circuit or a digital circuit, and for the circuit module that can be implanted with a program module, the realization of its module function can be realized by the program module provided by the prior art.

[0048] On the other hand, an embodiment of the utility model provides a distributed energy storage system, which includes a microcontroller unit, at least one communication transceiver, and a level conversion circuit for the communication signal as described above. In one embodiment, the distributed energy storage system also includes a transceiver power supply circuit; specifically, the transceiver power supply circuit includes at least one capacitor connected in parallel; the connection end of each of the first ends of the capacitors connected in parallel is respectively connected to an external power supply and a power supply end of the communication transceiver; the connection end of each of the second ends of the capacitors connected in parallel is grounded.

[0049] Further, as an example, Figure 6 As shown, the transceiver power supply circuit includes a first capacitor C1, a second capacitor C2 and a third capacitor C3; specifically, the connection end after the first end of the first capacitor C1, the first end of the second capacitor C2 and the first end of the third capacitor C3 are connected in parallel is respectively connected to the external power supply E3 and the power supply end of the communication transceiver 400; the connection end after the second end of the first capacitor C1, the second end of the second capacitor C2 and the second end of the third capacitor C3 are connected in parallel is grounded.

[0050] It should be noted that for ease of description, Figure 6 The distributed energy storage system is provided with a communication transceiver 400. In actual use, multiple communication transceivers 400 can be set for the distributed energy storage system, and each communication transceiver 400 is connected to a corresponding transceiver power supply circuit. The number of transceiver power supply circuits in the distributed energy storage system is the same as the number of communication transceivers 400, so as to provide a stable power supply for each communication transceiver 400; the number of communication transceivers 400 and transceiver power supply circuits can be determined according to actual conditions, and are also applicable to this embodiment. The embodiment provided in the present application can obtain power from the outside world based on the transceiver power supply circuit, filter the power supply, and power the communication transceiver, thereby improving the power supply stability of the distributed energy storage system.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A communication signal level conversion circuit connected between a micro control unit and at least one communication transceiver, characterized in that: The level conversion circuit of the communication signal includes a bidirectional level conversion chip and a unidirectional level conversion chip; The enable signal receiving end of the unidirectional level conversion chip is connected to the enable signal output end of the micro control unit, the enable signal output end of the unidirectional level conversion chip is connected to the enable end of the communication transceiver, and the unidirectional level conversion chip is used to perform level conversion on the enable signal sent by the micro control unit; The first signal receiving end of the bidirectional level conversion chip is connected to the communication signal output end of the micro control unit, the first signal output end of the bidirectional level conversion chip is connected to the signal receiving end of the communication transceiver, and the bidirectional level conversion chip is used to perform level conversion on the sending signal sent by the micro control unit; The second signal receiving end of the bidirectional level conversion chip is connected to the signal output end of the communication transceiver, and the second signal output end of the bidirectional level conversion chip is connected to the communication signal receiving end of the micro control unit. The bidirectional level conversion chip is also used to perform level conversion on the received signal sent by the communication transceiver.

2. The level conversion circuit for communication signals according to claim 1, wherein the enable terminal of the communication transceiver comprises a signal receiving enable terminal and a signal sending enable terminal, wherein: The enable signal output terminal of the unidirectional level conversion chip is connected to the signal receiving enable terminal and the signal sending enable terminal of the communication transceiver at the same time.

3. The level conversion circuit for communication signals according to claim 1, characterized in that: The level conversion circuit of the communication signal also includes a voltage comparator and a level monitor; The in-phase access terminal of the voltage comparator is connected to the enable signal output terminal of the unidirectional level conversion chip, and the inverting access terminal of the voltage comparator is connected to the enable signal receiving terminal of the unidirectional level conversion chip; The signal receiving end of the level monitor is connected to the output end of the voltage comparator, and the level monitor is used to issue an alarm prompt message when receiving a low level signal from the voltage comparator.

4. The level conversion circuit for communication signals according to claim 3, characterized in that: The level monitor includes an alarm controller and an audible and visual alarm; The signal receiving end of the alarm controller is connected to the output end of the voltage comparator. The alarm controller is used to control the sound and light alarm to send out alarm prompt information when receiving a low level signal from the voltage comparator.

5. The level conversion circuit for communication signals according to claim 4, characterized in that: The sound and light alarm is a sound and light lamp or a buzzer.

6. The level conversion circuit for communication signals according to claim 1, characterized in that: The level conversion circuit of the communication signal also includes a first power supply and a second power supply; The first power supply is respectively connected to the first power access terminal of the unidirectional level conversion chip and the first power access terminal of the bidirectional level conversion chip, and is used to provide a first operating voltage of a first preset voltage level for the unidirectional level conversion chip and the bidirectional level conversion chip; The second power supply is connected to the second power access terminal of the unidirectional level conversion chip and the second power access terminal of the bidirectional level conversion chip respectively, and is used to provide a second operating voltage of a second preset voltage level for the unidirectional level conversion chip and the bidirectional level conversion chip.

7. A distributed energy storage system, characterized in that: The distributed energy storage system comprises a micro control unit, at least one communication transceiver, and a level conversion circuit for a communication signal according to any one of claims 1 to 6.

8. The distributed energy storage system according to claim 7, characterized in that: The distributed energy storage system also includes a transceiver power supply circuit; The transceiver power supply circuit includes at least one capacitor connected in parallel; The connecting end after the first end of each capacitor is connected in parallel is respectively connected to an external power supply and a power supply end of the communication transceiver; The connection end of the second ends of each capacitor connected in parallel is grounded.

9. The distributed energy storage system according to claim 7, characterized in that: The communication transceiver is an RS485 communication transceiver.

10. The distributed energy storage system according to claim 7, characterized in that: The communication transceiver is an RS232 communication transceiver.

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