Isolation communication circuit and energy storage power supply

Abstract

The utility model provides an isolation communication circuit and an energy storage power supply. The isolation communication circuit comprises a signal input end, a signal output end, a signal receiving and transmitting end, an isolation module, a first level conversion module and a second level conversion module. The isolation module is used for isolating and outputting a first isolation signal when a first fault signal is received from the signal input end; and the first level conversion module is used for performing level conversion on the first isolation signal to output a first level signal to the signal transceiving end, so that the second equipment receives fault information sent by the first equipment. The second level conversion module is used for performing level conversion on a second fault signal to output a second level signal when the second fault signal is received from the signal receiving and transmitting end; and the isolation module is also used for isolating and outputting a second isolation signal to the signal output end, so that the first equipment receives fault information sent by the second equipment. According to the invention, the second equipment can realize bidirectional communication with the first equipment by adopting a single receiving and transmitting end.

Description

Isolated communication circuits and energy storage power supplies Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to an isolated communication circuit and an energy storage power supply. Background Technology

[0002] With the rapid development of power electronics technology, energy storage products are gaining popularity due to their advantages such as flexible power supply and high energy efficiency. However, as users' functional requirements continue to increase, the demand for MCU (Microcontroller Unit) port resources is increasing dramatically. If traditional circuit designs are used, replacing the MCU with one that has more ports is necessary to meet functional requirements, which will significantly increase the costs of hardware procurement, development, debugging, and subsequent maintenance, weakening the product's market competitiveness. Therefore, optimizing circuit design to improve port utilization efficiency without replacing the MCU, thus meeting functional requirements while effectively controlling costs, has become a key direction for energy storage product development. Summary of the Invention

[0003] This application provides an isolated communication circuit and energy storage power supply that achieves bidirectional communication through a single transceiver, reducing reliance on the control port of a second device (e.g., an MCU) and improving port utilization.

[0004] In a first aspect, embodiments of this application provide an isolated communication circuit, comprising a signal input terminal, a signal output terminal, a signal transceiver terminal, an isolation module, a first level conversion module, and a second level conversion module. The isolation module is connected to the signal input terminal, the signal output terminal, the first level conversion module, and the second level conversion module, respectively. Both the first and second level conversion modules are connected to the signal transceiver terminal. The signal input terminal is used to connect to the output terminal of a first device, the signal output terminal is used to connect to the input terminal of the first device, and the signal transceiver terminal is used to connect to the transceiver terminal of a second device. The isolation module is used to isolate the first fault signal received from the signal input terminal and output a first isolated signal to the first level conversion module based on the first fault signal. The first level conversion module is used to perform level conversion on the first isolated signal upon receiving it to output a first level signal to the signal transceiver terminal, so that the second device receives the fault information sent by the first device. The second level conversion module is used to convert the level of the second fault signal to output a second level signal to the isolation module when it receives the second fault signal from the signal transceiver terminal; the isolation module is also used to isolate the second level signal and output a second isolation signal to the signal output terminal based on the second level signal when it receives the second level signal, so that the first device can receive the fault information sent by the second device.

[0005] In some embodiments, the second level conversion module is further configured to, when receiving the first level signal from the first level conversion module, output the second level signal to the isolation module based on the first level signal, so that the first device determines that the isolation communication circuit is working.

[0006] In some embodiments, the first level conversion module includes a switch Q1 and a resistor R6. The control terminal of the switch Q1 is connected to both the first terminal of the resistor R6 and the isolation module. The first terminal of the switch Q1 is connected to both the second terminal of the resistor R6, the second level conversion module, and the signal transceiver terminal. The second terminal of the switch Q1 is grounded.

[0007] In some embodiments, the second level conversion module includes a switch Q2 and a resistor R4. The control terminal of the switch Q2 is simultaneously connected to the second terminal of the resistor R4, the first level conversion module, and the signal transceiver terminal. The first terminal of the switch Q2 is simultaneously connected to the first terminal of the resistor R4, the isolation module, and the power supply. The second terminal of the switch Q2 is grounded.

[0008] In some embodiments, the second level conversion module further includes a resistor R1. The first end of the resistor R1 is connected to the power supply, and the second end of the resistor R1 is simultaneously connected to the first end of the switching transistor Q2, the first end of the resistor R4, and the isolation module.

[0009] In some embodiments, the isolation module includes an isolator U1. A first input terminal of the isolator U1 is connected to the signal input terminal, a first output terminal of the isolator U1 is connected to the first level conversion module, a second input terminal of the isolator U1 is connected to the second level conversion module, and a second output terminal of the isolator U1 is connected to the signal output terminal.

[0010] In some embodiments, the isolation module further includes resistors R2 and R3. The first end of resistor R2 is connected to a power supply, the second end of resistor R2 is connected to the first input terminal of the isolator U1, the first end of resistor R3 is connected to the power supply, and the second end of resistor R3 is connected to the second output terminal of the isolator U1.

[0011] In some embodiments, the isolated communication circuit further includes a current limiting module. A first terminal of the current limiting module is connected to the connection point of the first level conversion module and the second level conversion module, and a second terminal of the current limiting module is connected to the signal transceiver terminal. The current limiting module is used to limit the current of the signal input to the second device and the signal output by the first level conversion module.

[0012] In some embodiments, the current limiting module includes a resistor R5. A first end of the resistor R5 is connected to the connection point of the first level conversion module and the second level conversion module, and a second end of the resistor R5 is connected to the signal transceiver terminal.

[0013] Secondly, embodiments of this application provide an energy storage power supply, which includes the isolated communication circuit described above.

[0014] Unlike existing technologies, this application provides an isolated communication circuit and an energy storage power supply. The isolated communication circuit includes a signal input terminal, a signal output terminal, a signal transceiver terminal, an isolation module, a first level conversion module, and a second level conversion module. When a first device detects a fault, it sends a first fault signal to the isolation module through the signal input terminal. The isolation module converts the signal into an optical / magnetic signal and then back into an electrical signal, generating an isolated first isolation signal, which is then transmitted to the first level conversion module. The first level conversion module performs level conversion processing on the first isolation signal and outputs a first level signal, which is then transmitted to a second device through the signal transceiver terminal (containing fault information sent by the first device). When the second device detects a fault, it sends a second fault signal to the second level conversion module through the signal transceiver terminal. The second level conversion module performs level conversion processing on the second fault signal and transmits the second level signal to the isolation module. The isolation module isolates the second level signal and generates a second isolation signal, which is finally transmitted to the first device through the signal output terminal (containing fault information sent by the second device). The embodiments of this application achieve bidirectional communication through a single transceiver, reducing reliance on the control port of a second device (e.g., an MCU) and thus improving port utilization. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 is a structural block diagram of an isolated communication circuit provided in an embodiment of this application;

[0017] Figure 2 is a structural block diagram of another isolated communication circuit provided in an embodiment of this application;

[0018] Figure 3 is a schematic diagram of an isolated communication circuit provided in an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0021] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0023] Please refer to Figure 1, which is a structural block diagram of an isolated communication circuit 100 provided in an embodiment of this application.

[0024] This application provides an isolated communication circuit 100, which includes a signal input terminal DSP_O, a signal output terminal DSP_I, a signal transceiver terminal ARM_RDY, an isolation module 10, a first level conversion module 20, and a second level conversion module 30. The isolation module 10 is connected to the signal input terminal DSP_O, the signal output terminal DSP_I, the first level conversion module 20, and the second level conversion module 30. Both the first level conversion module 20 and the second level conversion module 30 are connected to the signal transceiver terminal ARM_RDY. The signal input terminal DSP_O is used to connect to the output terminal of a first device (not shown), the signal output terminal DSP_I is used to connect to the input terminal of the first device (not shown), and the signal transceiver terminal ARM_RDY is used to connect to the transceiver terminal of a second device (not shown).

[0025] Specifically, isolation module 10 is used to isolate the first fault signal and output a first isolated signal to first level conversion module 20 based on the first fault signal when it receives a first fault signal from the signal input terminal DSP_O. First level conversion module 20 is used to perform level conversion on the first isolated signal upon receiving it to output a first level signal to the signal transceiver terminal ARM_RDY, so that the second device receives the fault information sent by the first device. Second level conversion module 30 is used to perform level conversion on the second fault signal and output a second level signal to isolation module 10 when it receives a second fault signal from the signal transceiver terminal ARM_RDY; isolation module 10 is also used to isolate the second level signal upon receiving it and output a second isolated signal to the signal output terminal DSP_I, so that the first device receives the fault information sent by the second device.

[0026] The first device can be a DSP (Digital Signal Processor). When the DSP determines that a fault exists in the circuit it is monitoring, it sends a first fault signal from the signal input terminal DSP_O in Figure 1 to the isolation communication circuit 100, which then transmits the signal to the second device. The DSP also receives fault information from the second device through the signal output terminal DSP_I in Figure 1.

[0027] The second device can be an MCU (Microcontroller Unit). When the MCU determines that a fault exists in the circuit it is monitoring, it sends a second fault signal from the signal transceiver terminal ARM_RDY in Figure 1 to the isolation communication circuit 100, which then transmits the signal to the first device. Furthermore, the MCU can also receive fault information from the first device from the signal transceiver terminal ARM_RDY in Figure 1.

[0028] The first fault signal is an electrical signal (such as high / low level) that is output to the isolation communication circuit 100 by the first device (e.g., DSP) when the circuit is detected to have a fault (such as algorithm overflow, data abnormality, etc.).

[0029] The first isolation signal is the signal output by the isolation module 10 after electrically isolating the first fault signal (e.g., an electrical signal after optocoupler isolation), ensuring that there is no direct electrical connection between the first device (e.g., DSP) and the second device (e.g., MCU).

[0030] The first level signal is the signal that the first level conversion module 20 sends to the second device (e.g., MCU) through the signal transceiver terminal ARM_RDY after level conversion of the first isolation signal.

[0031] The second fault signal is a signal that is detected by the second device (e.g., MCU) as a circuit fault or external device fault (such as sensor abnormality, communication timeout, etc.) and output to the isolation communication circuit 100 through the signal transceiver terminal ARM_RDY.

[0032] The second level signal is the signal after the second level conversion module 30 performs level conversion on the second fault signal.

[0033] The second isolation signal is the signal that the isolation module 10 sends to the first device (e.g., DSP) through the signal output terminal DSP_I after electrically isolating the second level signal.

[0034] In practical applications, when the first device (e.g., DSP) detects a fault, its output first fault signal is converted into a first isolation signal by the isolation module 10 (optical / magnetic coupling), and then converted into a first level signal that can be received by the second device (e.g., MCU) by the first level conversion module 20, and sent to the second device through the signal transceiver terminal ARM_RDY.

[0035] When a second device (e.g., an MCU) detects a fault, its output second fault signal is converted by the second level conversion module 30 into a second level signal compatible with the isolation module 10. The isolation module 10 then isolates the signal and outputs a second isolated signal to the signal output terminal DSP_I, completing the transmission of fault information. Throughout this process, the isolation module cuts off ground loop interference, and the level conversion module adapts to different voltage domains, ensuring reliable transmission of fault signals between high and low voltage systems and improving the system's anti-interference capability and safety. Simultaneously, bidirectional communication is achieved through a single transceiver, reducing reliance on the control port of the second device (e.g., the MCU) and improving port utilization.

[0036] In some embodiments, the second level conversion module 30 is further configured to output a second level signal to the isolation module 10 based on the first level signal when it receives a first level signal from the first level conversion module 20, so that the first device determines that the isolation communication circuit 100 is working.

[0037] Specifically, when the first device sends a first fault signal, after processing by the isolation module 10 and the first level conversion module 20, the first level conversion module 20 outputs a first level signal. This first level signal is transmitted not only to the second device but also to the second level conversion module 30. The second level conversion module 30 converts the first level signal into a second level signal, and after the isolation module 10 electrically isolates the second level signal, it sends a second isolation signal to the first device through the signal output terminal DSP_I. At this time, the first device can determine that the isolation communication circuit 100 is in normal working condition based on the sent first fault signal and the received second isolation signal.

[0038] Therefore, when the first device (e.g., DSP) sends the first fault signal, the signal path not only leads to the second device (MCU), but also forms a closed-loop feedback through the second level conversion module 30 and the isolation module 10.

[0039] In some embodiments, as shown in FIG3, the isolated communication circuit 100 further includes a current limiting module 40. The first end of the current limiting module 40 is connected to the connection point of the first level conversion module 20 and the second level conversion module 30, and the second end of the current limiting module 40 is connected to the signal transceiver terminal ARM_RDY.

[0040] Specifically, the current limiting module 40 is used to limit the current of the signal input from the second device and the signal output from the first level conversion module 20.

[0041] Please refer to Figure 3, which is a schematic diagram of the structure of an isolated communication circuit 100 provided in an embodiment of this application.

[0042] In some embodiments, the isolation module 10 includes an isolator U1.

[0043] Specifically, isolator U1's first input terminal INB is connected to the signal input terminal DSP_O; its first output terminal OUTB is connected to the first level conversion module 20; its second input terminal INA is connected to the second level conversion module 30; and its second output terminal OUTA is connected to the signal output terminal DSP_I. Isolator U1's first power input terminal VDD1 is connected to the first power supply +3.3V_S, and its second power input terminal VDD2 is connected to the second power supply +3.3V_P. Isolator U1's first ground terminal GND1 is connected to the first ground, and its second ground terminal GND2 is connected to the second ground.

[0044] Among them, the first power supply +3.3V_S and the second power supply +3.3V_P are two electrically isolated power supplies, and the first ground and the second ground are two electrically isolated grounds (GND).

[0045] Specifically, the isolator U1 can be an isolator of model NSi8221C1-DSWVR. In some other embodiments, the isolator U1 can be any isolation circuit or isolation device capable of electrically isolating the output of the first device (e.g., DSP) to the first level conversion module 20 and level isolating the second level conversion module 30 to the input of the first device (e.g., DSP).

[0046] In some embodiments, the isolation module 10 further includes resistors R2 and R3. The first end of resistor R2 is connected to a power supply (connection point is +3.3V_S, which can be a 3.3V DC power supply), the second end of resistor R2 is connected to the first input terminal INB of isolator U1, the first end of resistor R3 is connected to a power supply (connection point is +3.3V_S), and the second end of resistor R3 is connected to the second output terminal OUTA of isolator U1.

[0047] In some embodiments, the first level conversion module 20 includes a switch Q1 and a resistor R6. The control terminal of the switch Q1 is connected to both the first terminal of the resistor R6 and the isolation module 10. The first terminal of the switch Q1 is connected to both the second terminal of the resistor R6, the second level conversion module 30, and the signal transceiver terminal ARM_RDY. The second terminal of the switch Q1 is grounded.

[0048] In some embodiments, the second level conversion module 30 includes a switch Q2 and a resistor R4. The control terminal of the switch Q2 is simultaneously connected to the second terminal of the resistor R4, the first level conversion module 20, and the signal transceiver terminal ARM_RDY. The first terminal of the switch Q2 is simultaneously connected to the first terminal of the resistor R4, the isolation module 10, and the power supply. The second terminal of the switch Q2 is grounded.

[0049] In this embodiment, PNP transistors Q1 and Q2 are used as examples. The base of the PNP transistor is the control terminal of the switch Q1, the emitter of the PNP transistor is the first terminal of the switch Q1, and the collector of the PNP transistor is the second terminal of the switch Q1. The base of the PNP transistor is the control terminal of the switch Q2, the emitter of the PNP transistor is the first terminal of the switch Q2, and the collector of the PNP transistor is the second terminal of the switch Q2.

[0050] In addition, switching transistors Q1 and Q2 can be any controllable switch, such as insulated gate bipolar transistor (IGBT) devices, integrated gate commutated thyristor (IGCT) devices, gate turn-off thyristor (GTO) devices, silicon controlled rectifier (SCR) devices, junction gate field-effect transistor (JFET) devices, MOS controlled thyristor (MCT) devices, etc.

[0051] In some embodiments, the second level conversion module 30 further includes a resistor R1. The first end of resistor R1 is connected to a power supply, and the second end of resistor R1 is simultaneously connected to the first end of the switching transistor Q2, the first end of resistor R4, and the isolation module 10.

[0052] In some embodiments, the current limiting module 40 includes a resistor R5. The first end of resistor R5 is connected to the connection point of the first level conversion module 20 and the second level conversion module 30, and the second end of resistor R5 is connected to the signal transceiver terminal ARM_RDY.

[0053] The working principle of the isolation communication circuit 100 shown in Figure 3 is briefly explained below.

[0054] As shown in Figure 3, +3.3V_S is the high-voltage side power supply, and +3.3V_P is the low-voltage side power supply.

[0055] When the first device (e.g., DSP) does not send the first fault signal (low-level signal) through the input terminal DSP_O, and the second device (e.g., MCU) does not send the second fault signal (low-level signal) through the signal transceiver terminal ARM_RDY, the input terminal DSP_O, the signal output terminal DSP_I, and the signal transceiver terminal ARM_RDY are all at a high level.

[0056] When the first device (e.g., a DSP) determines a fault in the circuit, it sends a low-level signal (first fault signal) through its input terminal DSP_O. This low-level signal is then input to the first input terminal INB of isolator U1. After isolation by isolator U1, the first output terminal OUTB of isolator U1 is pulled low (first isolation signal). Next, switch Q1 is turned on because its control terminal is pulled low, thereby pulling the signal transceiver terminal ARM_RDY low (first level signal). At this time, the second device (e.g., an MCU) receives the pulled-low first level signal through the signal transceiver terminal ARM_RDY. The second device will quickly take protective measures to prevent damage to the components in the circuit or to prevent the damage from escalating. At the same time, the switching transistor Q2 is turned on because its control terminal is pulled low, so the second input terminal INA of the isolator U1 is pulled low (second level signal), the second output terminal OUTA of the isolator U1 is pulled low (second isolation signal), that is, the signal output terminal DSP_I will also be pulled low. The first device (e.g., DSP) can confirm that the isolation communication circuit 100 is in normal working condition or the signal transceiver terminal ARM_RDY (second device) has sent fault information (second fault signal) at the same time.

[0057] When the second device (e.g., an MCU) determines a fault in the circuit, it sends a low-level signal (second fault signal) through the signal transceiver terminal ARM_RDY. Switch Q2 is turned on because its control terminal is pulled low, thus pulling the second input terminal INA of isolator U1 low (second level signal). After isolation by isolator U1, the second output terminal OUTA of isolator U1 is pulled low (second isolation signal), meaning the signal output terminal DSP_I is also pulled low. At this time, the first device (e.g., a DSP) receives the pulled-low second isolation signal through the signal output terminal DSP_I and will quickly take protective measures to protect the components in the circuit from damage or prevent the damage from escalating.

[0058] The isolated communication circuit 100 provided in this application embodiment achieves bidirectional communication through a single transceiver end, reducing dependence on the control port of a second device (e.g., an MCU) to improve port utilization.

[0059] This application embodiment also provides an energy storage power supply, which includes the isolated communication circuit 100 as described above.

[0060] Specifically, the specific structure and working principle of the isolation communication circuit 100 can be referred to the above embodiments, and will not be repeated here.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An isolated communication circuit, characterized in that, The isolated communication circuit includes a signal input terminal, a signal output terminal, a signal transceiver terminal, an isolation module, a first level conversion module, and a second level conversion module. The isolation module is connected to the signal input terminal, the signal output terminal, the first level conversion module, and the second level conversion module. Both the first and second level conversion modules are connected to the signal transceiver terminal. The signal input terminal is used to connect to the output terminal of a first device, the signal output terminal is used to connect to the input terminal of the first device, and the signal transceiver terminal is used to connect to the transceiver terminal of a second device. When the isolation module receives a first fault signal from the first device at the signal input terminal, it isolates the first fault signal and outputs a first isolated signal to the first level conversion module based on the first fault signal. The first level conversion module is used to convert the level of the first isolation signal to output a first level signal to the signal transceiver terminal when the first isolation signal is received, so that the second device can receive the fault information sent by the first device; The second level conversion module is used to convert the level of the second fault signal received from the signal transceiver terminal to output a second level signal to the isolation module. The isolation module is also used to isolate the second level signal when it receives the second level signal and output a second isolation signal to the signal output terminal based on the second level signal, so that the first device receives the fault information sent by the second device.

2. The isolated communication circuit according to claim 1, characterized in that, The second level conversion module is further configured to, when receiving the first level signal from the first level conversion module, output the second level signal to the isolation module based on the first level signal, so that the first device determines that the isolation communication circuit is working.

3. The isolated communication circuit according to claim 1, characterized in that, The first level conversion module includes a switch Q1 and a resistor R6; the control terminal of the switch Q1 is connected to the first terminal of the resistor R6 and the isolation module, the first terminal of the switch Q1 is connected to the second terminal of the resistor R6, the second level conversion module and the signal transceiver terminal, and the second terminal of the switch Q1 is grounded.

4. The isolated communication circuit according to claim 1, characterized in that, The second level conversion module includes a switch Q2 and a resistor R4; the control terminal of the switch Q2 is simultaneously connected to the second terminal of the resistor R4, the first level conversion module, and the signal transceiver terminal; the first terminal of the switch Q2 is simultaneously connected to the first terminal of the resistor R4, the isolation module, and the power supply; and the second terminal of the switch Q2 is grounded.

5. The isolated communication circuit according to claim 4, characterized in that, The second level conversion module also includes a resistor R1; the first end of the resistor R1 is connected to the power supply, and the second end of the resistor R1 is simultaneously connected to the first end of the switch Q2, the first end of the resistor R4, and the isolation module.

6. The isolated communication circuit according to claim 1, characterized in that, The isolation module includes an isolator U1; the first input terminal of the isolator U1 is connected to the signal input terminal, the first output terminal of the isolator U1 is connected to the first level conversion module, the second input terminal of the isolator U1 is connected to the second level conversion module, and the second output terminal of the isolator U1 is connected to the signal output terminal.

7. The isolated communication circuit according to claim 6, characterized in that, The isolation module also includes resistors R2 and R3; the first end of resistor R2 is connected to the power supply, the second end of resistor R2 is connected to the first input terminal of the isolator U1, the first end of resistor R3 is connected to the power supply, and the second end of resistor R3 is connected to the second output terminal of the isolator U1.

8. The isolated communication circuit according to claim 1, characterized in that, The isolated communication circuit further includes a current limiting module. The first end of the current limiting module is connected to the connection point of the first level conversion module and the second level conversion module, and the second end of the current limiting module is connected to the signal transceiver terminal. The current limiting module is used to limit the current of the signal input to the second device and the signal output by the first level conversion module.

9. The isolated communication circuit according to claim 8, characterized in that, The current limiting module includes a resistor R5; the first end of the resistor R5 is connected to the connection point of the first level conversion module and the second level conversion module, and the second end of the resistor R5 is connected to the signal transceiver terminal.

10. An energy storage power source, characterized in that, The energy storage power supply includes the isolated communication circuit as described in any one of claims 1 to 9.

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