Relay output circuit for dry and wet node switching and EMS energy storage management terminal

Abstract

The invention belongs to the technical field of EMS energy storage management, and particularly relates to a dry and wet node switching relay output circuit and an EMS energy storage management terminal. The output circuit comprises an outlet relay and a double-contact relay; the common end of the first group of contacts of the double-contact relay and the normally closed end of the second group of contacts of the double-contact relay are connected with the first end of the contacts of the outlet relay; the common end of the second group of contacts and the normally closed end of the first group of contacts of the double-contact relay are connected with the pins, close to the first end, of the open-out terminals. One of the normally open ends of the first group of contacts and the normally open ends of the second group of contacts of the double-contact relay is connected with the positive electrode of the outlet power supply, and the other one is connected with the negative electrode of the outlet power supply. The technical problem of short circuit risk in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of EMS energy storage management terminals, and particularly relates to a relay output circuit for dry-wet node switching and an EMS energy storage management terminal. BACKGROUND

[0002] An EMS (Energy Management System) energy storage management terminal in the field of energy storage includes an output circuit function, which is realized by a relay. The output circuit is divided into two types according to applications: a passive outlet circuit that only serves as a loop switch, referred to as a dry node; and an active outlet circuit that serves as a power output loop switch, referred to as a wet node.

[0003] To realize the hardware configurable switching compatibility of the dry-wet nodes of the relay outlet circuit, conventional design needs to simulate the circuit “switch” through a jumper, a dial switch and other components, and manual assembly and switching are performed according to actual requirements to realize the function conversion of the dry node and the wet node. The configurable switching compatibility design principle of the dry node and the wet node of the relay outlet circuit is shown in FIGS. Figure 1 and Figure 2 In the actual application of the EMS energy storage management terminal, the dry-wet node configuration switching needs to be performed manually according to the requirements on site, the device needs to be disassembled from the assembly screen cabinet, the device housing needs to be opened, and the jumper or dial switch of the switch 1~3 function needs to be switched. A large amount of manpower and time are consumed, and the debugging cost is increased.

[0004] The Chinese utility model patent with the authorization announcement number CN219104969U and the authorization announcement date of May 30, 2023 discloses a handheld convenient VFD cabinet test box. The test box includes an active-passive conversion circuit for switching the active-passive output state (i.e., dry-wet node conversion) of the output circuit. The active-passive switching switch connected between the positive and negative poles of the power conversion module and the intermediate relay with the normally closed contact in series between the two DO output ends are used to realize the switching. In the passive mode, the active-passive switching switch is open, and the output circuit is passively output. In the active mode, the active-passive switching switch is closed, the intermediate relay is powered, the normally closed contact of the intermediate relay is open, and the output circuit is actively output. However, the above scheme needs the main control to output two control signals at the same time, and the two control signals are used to control the active-passive switching switch and the intermediate relay, respectively. Strict timing control needs to be considered. When switching to the active mode, the contact of the intermediate relay must be disconnected first, and then the active-passive switching switch can be closed. When switching to the passive mode, the active-passive switching switch must be disconnected first, and then the contact of the intermediate relay can be closed. Once the timing is wrong or the relay is in action, a short circuit problem will occur, causing damage, and a large amount of main control resources needs to be occupied. SUMMARY

[0005] The application aims to provide a dry-wet node switching relay outgoing circuit and an EMS energy storage management terminal to solve the technical problem of short circuit risk caused by the need for two control signals for dry-wet node switching in the prior art.

[0006] To solve the above technical problem, the application provides a dry-wet node switching relay outgoing circuit, which comprises an outlet relay and a double-contact relay.

[0007] The above technical solution has the following beneficial effects: compared with the prior art in which two control signals with strict time sequence are needed to control the switching of dry nodes and wet nodes, the embodiment only needs one double-contact relay to control the switching of the switch, only one control signal is needed to control the switching action of the relay contact position, and even if there is a time deviation, there is no risk of short circuit, the switch between the outgoing terminal and the outlet power supply and the switch for avoiding the short circuit of the positive and negative poles of the outlet power supply are always mutually exclusive and cannot be closed at the same time. The application solves the technical problem of short circuit risk caused by the need for two control signals for dry-wet node switching in the prior art.

[0008] Further, the relay outgoing circuit further comprises a controllable switch tube, the coil of the double-contact relay is connected in series with the controllable switch tube, and the control end of the controllable switch tube is connected with a master control unit, so that the coil of the double-contact relay is powered on or off.

[0009] Further, diodes are connected in parallel across the coil of the double-contact relay to eliminate reverse high voltage when the power is off.

[0010] Further, the normally open end of the first group of contacts of the double-contact relay is connected with the positive pole of the outlet power supply, and the normally open end of the second group of contacts is connected with the negative pole of the outlet power supply.

[0011] Further, the controllable switch tube is a triode, and the control end of the controllable switch tube is the base of the triode.

[0012] The application also provides a technical scheme of an EMS energy storage management terminal, which is an EMS energy storage management terminal comprising a relay outgoing circuit and a master control unit, wherein the relay outgoing circuit comprises an outlet relay controlled by the master control unit, and further comprises a double-contact relay; the common end of the first group of contacts of the double-contact relay and the normally closed end of the second group of contacts are connected to the first end of the contacts of the outlet relay; the common end of the second group of contacts of the double-contact relay and the normally closed end of the first group of contacts are connected to the pin close to the first end in the outgoing terminal; one of the normally open end of the first group of contacts and the normally open end of the second group of contacts of the double-contact relay is connected to the positive pole of the outlet power supply, and the other is connected to the negative pole of the outlet power supply.

[0013] The beneficial effects of the above technical scheme are that, compared with the prior art which needs two control signals with strict time sequence to control the switching of the dry node and the wet node, the embodiment only needs one double-contact relay to control the switching of the switch, only needs one control signal to control the switching action of the relay contact position, and even if there is a time deviation, there is no risk of short circuit, and the switch between the outgoing terminal and the outlet power supply and the switch for avoiding the short circuit of the positive and negative poles of the outlet power supply are always mutually exclusive and cannot be closed at the same time. The application solves the technical problem of the prior art that two control signals are needed for the switching of the dry node and the wet node, resulting in the risk of short circuit.

[0014] Further, the relay outgoing circuit further comprises a controllable switch tube, the coil of the double-contact relay is connected in series with the controllable switch tube, and the control end of the controllable switch tube is connected with the master control unit, so that the coil of the double-contact relay is powered on or powered off.

[0015] Further, diodes are connected in parallel across the coil of the double-contact relay to eliminate reverse high voltage when the power is off.

[0016] Further, the normally open end of the first group of contacts of the double-contact relay is connected to the positive pole of the outlet power supply, and the normally open end of the second group of contacts is connected to the negative pole of the outlet power supply.

[0017] Further, the controllable switch tube is a triode, and the control end of the controllable switch tube is the base of the triode. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A circuit diagram for the dry node in the prior art is configured; Figure 2 A circuit diagram for the wet node in the prior art is configured; Figure 3 A circuit diagram for the relay outgoing circuit for the switching of the dry node and the wet node in the embodiment of the application is configured. DETAILED DESCRIPTION

[0019] Compared with the prior art, the present embodiment only needs one double-contact relay to control the switching of the switch, only one control signal is needed to control the switching action of the relay contact position, and there is no risk of short circuit even if there is a time deviation. The opening of the terminal and the outlet power supply (i.e. switches 1 and 3) and the switch for avoiding the short circuit of the positive and negative poles of the outlet power supply (i.e. switch 2) are always mutually exclusive, and cannot be closed at the same time. The present application solves the technical problem of the prior art that two control signals are needed for dry and wet node switching, which leads to the risk of short circuit.

[0020] Relay opening circuit embodiment for dry and wet node switching: The existing relay opening circuit for dry and wet node switching is shown in Figure 1 and Figure 2 The positive and negative poles (D1+ and D1-) of the opening terminal are provided with switches 2 and contacts RL1B of RL1 of the outlet relay connected in series, the positive + end OUT_VCC of the outlet power supply is connected to the series connection point (CK-2 in the figure) of switches 1 and 2 and RL1B, and the negative - end OUT_GND of the outlet power supply is connected to the opposite end (D1 in the figure) of the switch relative to the series connection point. The power supply or power loss of the coil RL1A of the outlet relay is controlled by the main control CPU, so that the contact RL1B is closed or opened to output the corresponding opening signal.

[0021] When switch 2 is closed and switches 1 and 3 are both open, the opening terminal D1+ / D1- is disconnected from the positive and negative poles of the outlet power supply, and at this time the opening terminal D1+ / D1- is configured as a dry node and only serves as a loop switch. When switch 2 is open and switches 1 and 3 are both closed, the opening terminal D1+ / D1- is connected to the positive and negative poles of the outlet power supply, and switch 2 is open to avoid short circuit of the outlet power supply, and at this time the opening terminal D1+ / D1- is configured as a wet node and serves as an active outlet circuit for power output loop switch.

[0022] However, the above switching process needs to manually disassemble the device from the assembly screen cabinet, open the device shell, and exchange the jumper pins or dial switches of switches 1-3. A large amount of manpower and time is consumed, and the debugging cost is increased. Therefore, the above switches 1, 2 and 3 can be automatically switched by a relay, which can save manpower and time cost and improve work efficiency. However, the states of switches 1 / 3 and switch 2 need to be strictly mutually exclusive, especially cannot be closed at the same time, otherwise there is a risk of short circuit. Therefore, when switches 1 / 3 and switch 2 are controlled separately, if the relay contact action is not timely, switches 1 / 3 and switch 2 may be turned on at the same time, causing OUT_VCC and OUT_GND to be short-circuited, which may cause a safety accident.

[0023] Therefore, as shown in Figure 3As shown, the embodiment introduces a double-contact relay (i.e. Figure 3 RL2) in the RL2, the double-contact relay has two groups of contacts, which are the first group of contacts RL2B and the first group of contacts RL2C, and each group of contacts has the same structure, which is composed of one normally open end, one common end and one normally closed end.

[0024] Specifically, as shown in Figure 3 , the normally open end 4, the common end 3 and the normally closed end 2 constitute the first group of contacts RL2B, and the normally open end 5, the common end 6 and the normally closed end 7 constitute the first group of contacts RL2C. The common end 3 of RL2B is connected with the CK-2 (i.e. the first end) of the contact RL1B of the RL1 of the outlet relay, the normally closed end 2 of RL2B is connected with the D1- pin signal network of the outlet terminal (i.e. the pin D1- close to the first end in the outlet terminal), the normally closed end 7 of RL2C is connected with the CK-2, and the common end 6 of RL2C is connected with the D1-, that is, the contacts 2-3 and 6-7 realize the function of the original switch 2.

[0025] It should be noted that the "first end" here refers to any end of RL1B, that is, the CK-1 of the contact RL1B can also be regarded as the first end, at this time, the pin close to the first end CK-1 in the outlet terminal is Figure 3 the pin at D1+ in the circuit topology.

[0026] "Close to the first end" means that in the circuit topology, the connection with the first end does not need to pass through one side of the "second end" (i.e. the other end except the first end) of RL1B.

[0027] The normally open end 4 of RL2B is connected with the outlet power positive end OUT_VCC, and the normally open end 5 of RL2C is connected with the outlet power negative end OUT_GND, that is, the contact 3-4 realizes the function of the original switch 1, and the contact 5-6 realizes the function of the original switch 3.

[0028] The outlet circuit further includes a master CPU, and the wet / dry node of the master CPU is configured to connect the output end of the control signal CPU_GS with the base electrode (i.e. the control end of the controllable switch tube) of the triode Q2 through the resistance R2, the coil RL2A of the RL2 of the double-contact relay is connected in series between the 5V power supply node and the collector electrode of the triode Q2, the two ends of the coil RL2A are connected in parallel with the diode D2, and the emitter electrode of the triode Q2 is grounded.

[0029] The control signal output circuit of RL1 of the outlet relay is the same as the control signal output circuit of the dry-wet node switching. The output end of the outlet control signal CPU_CK for controlling RL1 of the outlet relay is connected with the base of the transistor Q1 through the resistor R1, the coil RL1A of RL1 of the outlet relay is connected in series between the 5V power supply node and the collector of the transistor Q1, the two ends of the coil RL1A are connected in parallel with the diode D1, and the emitter of the transistor Q1 is grounded.

[0030] The diode D1 or the diode D2 is used to form a low impedance loop at power-off, so that the relay coil energy storage energy is released in the form of current, thereby eliminating the reverse high voltage.

[0031] The working principle of the relay outlet circuit of the embodiment is as follows: (1) Dry node configuration: The CPU_GS outputs "L" logic low level, the transistor Q2 is turned off, the relay coil RL2A has no voltage difference, the contacts RL2B and RL2C are not actuated to keep the default state, the RL2B contact feet 2 and 3 are closed and shorted, the RL2C contact feet 6 and 7 are closed and shorted, that is, the CK-2 network is shorted with the D1-network (switch 2 is closed), the CK-2 network is disconnected with the OUT_VCC network (switch 1 is disconnected), the D1-network is disconnected with the OUT_GND (switch 3 is disconnected) network, and the dry node configuration function is realized. The CPU_CK outputs "L" logic low level, the transistor Q1 is turned off, the relay coil RL1A has no voltage difference, the contact RL1B is not actuated, and no outlet; the CPU_CK outputs "H" logic high level, the transistor Q1 is turned on, the relay coil RL1A has a voltage difference, the contact RL1B is actuated to be closed, and the outlet is realized.

[0032] (2) Wet node configuration: The CPU_GS outputs "H" logic high level, the transistor Q2 is turned on, the relay coil RL2A has a voltage difference, the contacts RL2B and RL2C are actuated, the RL2B contact feet 2 and 4 are closed and shorted, the RL2C contact feet 6 and 5 are closed and shorted, that is, the CK-2 network is disconnected with the D1-network (switch 2 is disconnected), the CK-2 network is shorted with the OUT_VCC network (switch 1 is closed), the D1-network is shorted with the OUT_GND (switch 3 is closed) network, and the wet node configuration function is realized. The CPU_CK outputs "L" logic low level, the transistor Q1 is turned off, the relay coil RL1A has no voltage difference, the contact RL1B is not actuated, and no outlet; the CPU_CK outputs "H" logic high level, the transistor Q1 is turned on, the relay coil RL1A has a voltage difference, the contact RL1B is actuated to be closed, and the outlet is realized.

[0033] In the embodiment, the triode is used as the controllable switch tube to realize the conversion of the control signal output by the main control CPU to the power gain or loss of the relay coil. In other embodiments, other types of controllable switch tubes can also be used, such as thyristors with gate control terminals, MOSFETs (Metal Oxide Semiconductor Field Effect Transistor) with gate control terminals, IGBTs (Insulated Gate Bipolar Transistor), and the like.

[0034] In other embodiments, the normally open end 4 of the RL2B is connected to the positive OUT_GND of the outlet power supply, and the normally open end 5 of the RL2C is connected to the negative OUT_VCC of the outlet power supply. At this time, when the wet node is configured as the power output, Figure 3 The upper output terminal is positive, and the lower output terminal is negative.

[0035] EMS energy storage management terminal embodiment: An EMS energy storage management terminal includes a relay output circuit and a main control unit. The relay output circuit includes an outlet relay and a main control unit controlled by the main control unit. The relay output circuit further includes a double-contact relay. The common end of the first group of contacts of the double-contact relay is connected to the first end of the contacts of the outlet relay. The common end of the second group of contacts of the double-contact relay is connected to the pin close to the first end in the outlet terminal. One of the normally open ends of the first group of contacts and the normally open ends of the second group of contacts of the double-contact relay is connected to the positive pole of the outlet power supply, and the other is connected to the negative pole of the outlet power supply. One of the normally closed ends of the first group of contacts and the normally closed ends of the second group of contacts of the double-contact relay is connected to any one of the pin close to the first end in the outlet terminal and the first end, and the other of the normally closed ends of the first group of contacts and the normally closed ends of the second group of contacts is connected to the other of the pin close to the first end in the outlet terminal and the first end or is left hanging. The specific relay output circuit has been described in detail in the above-mentioned dry-wet node switching relay output circuit embodiment, and will not be repeated here.

[0036] In particular, the master unit can be any data processing function that can be a general-purpose central processing unit (CPU), a graphics processing unit (GPU), a microcontroller, a reduced instruction set computer (RISC) processor, an application specific integrated circuit (ASIC), a programmable logic circuit (PLC), a field programmable gate array (FPGA), a digital signal processor (DSP) and / or any other circuit or processing device capable of performing the functions of the methods described in the present application.

[0037] The present application has the following features: The present application proposes a relay output circuit with dry and wet nodes automatically switched by a double-contact double-position relay instead of manually operating the needle, code switch and other components. By modifying the configuration program through the debugging interface, the contact position of the double-contact double-position relay is controlled to realize the configuration and exchange of the dry and wet node circuit functions. The present application can avoid manual operations such as device disassembly, needle position exchange and other components, greatly saving the on-site debugging manpower and time cost, and improving the work efficiency.

[0038] Compared with the scheme of double-relay separate control, the present application only needs one switching relay and one control signal, the mode switching control logic of the dry and wet nodes is simple, the power supply short circuit requires switches 1 / 2 / 3 to be closed to achieve, one control signal controls the relay, and the two contact position switching actions have no short circuit risk even if there is a time deviation. Switch 2 and switch 1 / 3 are always mutually exclusive and cannot be closed at the same time. The present application has the advantages of simple circuit structure, simple control logic, small main control resource occupation, no power supply short circuit risk and the like.

[0039] Finally, it should be noted that the above description is only the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative labor, or equivalently replace some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A dry wet node switching relayed power circuit comprising an outlet relay, characterized in that, The relay outgoing circuit further comprises a double-contact relay; a common end of a first group of contacts and a normally closed end of a second group of contacts of the double-contact relay are connected to a first end of the contact of the outlet relay; a common end of the second group of contacts and a normally closed end of the first group of contacts of the double-contact relay are connected to a pin close to the first end in the outlet terminal; one of a normally open end of the first group of contacts and a normally open end of the second group of contacts of the double-contact relay is connected to a positive pole of the outlet power supply, and the other is connected to a negative pole of the outlet power supply.

2. The dry wet node switched relayed breakout circuit of claim 1, wherein, The relay outgoing circuit further comprises a controllable switch tube, the coil of the double-contact relay is connected in series with the controllable switch tube, and a control end of the controllable switch tube is connected with the master control unit, so that the coil of the double-contact relay is powered on or powered off.

3. The dry wet node switched relayed break-out circuit of claim 2, wherein, Diodes for eliminating reverse high voltage when power is off are connected in parallel across the coil of the double-contact relay.

4. The dry-wet node switching relay output circuit according to any one of claims 1 to 3, characterized by The normally open end of the first group of contacts of the double-contact relay is connected to the positive pole of the outlet power supply, and the normally open end of the second group of contacts is connected to the negative pole of the outlet power supply.

5. The dry wet node switched relayed break out circuit of claim 2, wherein, The controllable switch tube is a triode, and the control end of the controllable switch tube is the base of the triode.

6. An EMS energy storage management terminal comprising a relay output circuit and a master control unit, the relay output circuit comprising an outlet relay controlled by the master control unit, characterized in that, The relay outgoing circuit further comprises a double-contact relay; a common end of a first group of contacts and a normally closed end of a second group of contacts of the double-contact relay are connected to a first end of the contact of the outlet relay; a common end of the second group of contacts and a normally closed end of the first group of contacts of the double-contact relay are connected to a pin close to the first end in the outlet terminal; one of a normally open end of the first group of contacts and a normally open end of the second group of contacts of the double-contact relay is connected to a positive pole of the outlet power supply, and the other is connected to a negative pole of the outlet power supply.

7. The EMS energy storage management terminal of claim 6, wherein, The relay outgoing circuit further comprises a controllable switch tube, the coil of the double-contact relay is connected in series with the controllable switch tube, and a control end of the controllable switch tube is connected with the master control unit, so that the coil of the double-contact relay is powered on or powered off.

8. The EMS energy storage management terminal of claim 7, wherein, Diodes for eliminating reverse high voltage when power is off are connected in parallel across the coil of the double-contact relay.

9. The EMS energy storage management terminal according to any one of claims 6 to 8, characterized by, The normally open end of the first group of contacts of the double-contact relay is connected to the positive pole of the outlet power supply, and the normally open end of the second group of contacts is connected to the negative pole of the outlet power supply.

10. The EMS energy storage management terminal of claim 7, wherein, The controllable switch tube is a triode, and the control end of the controllable switch tube is the base of the triode.

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