A relay control method for an energy storage device

Abstract

The application relates to a relay control method for an energy storage device, which comprises the following steps: collecting the output voltage of a circuit and judging whether the circuit has reached a conductive condition according to the output voltage of the circuit; performing the connection operation of a conductive loop and a relay after the conductive condition is met, and judging whether the relay normally works according to operation data; performing the connection operation of an energy-saving loop and the relay after a switching condition is met, judging whether the energy-saving loop can keep the relay normally working after the conductive loop is cut off, and disconnecting the connection between the conductive loop and the relay under the condition that the energy-saving loop can keep the relay normally working after the conductive loop is cut off; judging whether the circuit is safely working according to the output voltage of the circuit, and disconnecting the connection between the energy-saving loop and the relay and the connection between the conductive loop and the relay if the circuit is in an unsafe working state. The method is favorable for reducing the power consumption of the relay under the condition of ensuring the safety of the circuit operation.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically to a high-safety relay energy-saving control method for energy storage devices. Background Technology

[0002] Relays are common electrical control components, widely used in various electrical equipment to control and connect circuits. However, relays require continuous power during operation, resulting in high power consumption, excessive energy consumption, and unnecessary power consumption and heat generation.

[0003] Currently, methods to reduce relay power consumption mainly include: using a microprocessor to output a PWM signal with a variable duty cycle to drive the relay to turn on and off, and switching the relay current from its higher pull-in value to a lower holding value by switching the conduction circuit. Using a microprocessor to reduce relay power consumption, as the duty cycle of the output PWM signal decreases, the average power consumption of the relay can be reduced. This method requires maintaining a sufficiently high pulse rate regardless of the duty cycle to ensure that the average current of the relay can maintain its on-state. Chinese patent CN110379675A discloses a relay driving circuit and a low-power relay method. The circuit includes a microcontroller, a PWM driver, a relay, and a zero-crossing detector. The method of protecting the relay using this circuit includes the following steps: detecting whether there is a switching demand for the relay; when a switching demand is detected, controlling the switching time based on the zero-crossing signal detected by the zero-crossing detector, and controlling the PWM driver to drive the MOSFET to control the relay switching. Using this invention, the holding voltage of the relay can be reduced without adding other circuits, saving circuit costs. At the same time, the relay power consumption is reduced, heat generation is reduced, which can greatly increase the lifespan of the relay and reduce the impact of heat generation on other electronic components. However, if the circuit disclosed in the above patent generates too high a frequency of PWM, it will place a heavy burden on the microcontroller and affect the safe and reliable operation of the circuit.

[0004] The method of switching the relay current from a higher pull-in value to a lower hold value by switching the conduction circuit mainly uses a 555 timer circuit or an RC timer circuit. However, using these two circuits for switching the conduction circuit has the following problems: the 555 timer circuit has high power consumption, and its frequency is greatly affected by temperature and circuit fluctuations; while the RC timer circuit is also easily affected by environmental conditions, difficult to control, and has low accuracy. Chinese patent CN205248192U discloses a low-power relay drive circuit, including a relay, a first resistor, a second resistor, a capacitor, a diode, and a transistor; one end of the first resistor is connected to the control signal input node, and the other end is connected to the base of the transistor; the cathode of the diode is connected to the power supply, the anode of the diode is connected to the collector of the transistor, and the diode is connected in parallel with the control coil of the relay; one end of the second resistor is connected to the emitter of the transistor, and the other end is connected to a reference ground; the capacitor is connected in parallel with the second resistor. Using the above scheme, when the transistor is turned on, the relay is energized, and the capacitor stores energy. As the emitter voltage of the transistor continuously increases, the power consumption of the relay continuously decreases, thus maintaining the relay's operation with low power consumption, saving energy and reducing operating costs. However, the circuit control precision disclosed in the above patent is not high, making it difficult to achieve a high-safety, energy-saving circuit effect. Summary of the Invention

[0005] The purpose of this invention is to provide a relay control method for energy storage devices, which helps to reduce relay power consumption while ensuring circuit operation safety.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a relay control method for an energy storage device, comprising:

[0007] The output voltage of the acquisition circuit is collected, and the circuit is judged based on the output voltage to determine whether the circuit has reached the conduction condition.

[0008] Once the conduction conditions are met, the circuit is connected to the relay, and the relay is judged to be working properly based on the operating data.

[0009] After the switching conditions are met, the energy-saving circuit and the relay are connected. It is determined whether the energy-saving circuit can keep the relay running normally after the conducting circuit is cut off. If the energy-saving circuit can keep the relay running normally after the conducting circuit is cut off, the connection between the conducting circuit and the relay is disconnected, so that the relay only works in the energy-saving circuit and its power consumption is reduced.

[0010] Determine whether the circuit is operating safely based on its output voltage. If the circuit is in an unsafe operating state, disconnect the energy-saving circuit from the relay and the conduction circuit from the relay.

[0011] Furthermore, the output voltage of the acquisition circuit is used to determine whether the circuit has reached the conduction condition, including:

[0012] The output voltage data of the circuit is acquired using a voltage sensor, and the acquired output voltage data is reduced and converted before being input into the microprocessor;

[0013] After the microprocessor obtains the converted output voltage data, it determines whether the converted output voltage data is within the normal operating voltage range. If so, the conduction condition has been met; otherwise, the conduction condition has not been met.

[0014] Furthermore, the calculation formula for reducing and converting the output voltage data is as follows:

[0015]

[0016] Wherein, Uinput1 is the acquired output voltage data; k1 is the first reduction constant; and Uoutput1 is the converted output voltage data.

[0017] The expression for determining whether the converted output voltage data is within the normal operating voltage range is as follows:

[0018]

[0019] Where Resultu is the result of judging whether the output voltage data is normal, and Un is the target output voltage of the circuit. If the result Resultu = 0, it means that the output voltage of the circuit has not yet stabilized and has not reached the conduction condition, so the circuit and the relay are not connected. If the result Resultu = 1, it means that the output voltage of the circuit has stabilized and has reached the conduction condition, so the circuit and the relay can be connected.

[0020] Furthermore, after the conduction conditions are met, the connection operation between the conduction circuit and the relay is executed, and the normal operation of the relay is determined based on the operating data, including:

[0021] The microprocessor applies a high level to the gate of the first fully controlled switching device connected to the conduction circuit, thereby turning on the conduction circuit. After the conduction circuit is connected to the relay, the microprocessor detects the relay's operating current data, reduces and converts the acquired relay operating current data, and then inputs it into the microprocessor.

[0022] After the microprocessor obtains the converted relay operating current data, it determines whether the relay is working properly based on the relay operating current data.

[0023] Furthermore, the calculation formula for reducing and transforming the acquired relay operating current data is as follows:

[0024]

[0025] Where Iinput1 is the acquired relay operating current data; k2 is the second reduction constant; and Ioutput1 is the converted relay operating current data.

[0026] The expression for determining whether a relay is working properly based on its operating current data is as follows:

[0027]

[0028] Here, Resulti1 is the judgment result of whether the relay is working properly; if the judgment result Resulti1 = 0, it means that the relay is not working properly, and the microprocessor will then apply a low level to the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the conduction circuit; if the judgment result Resulti1 = 1, it means that the relay is working properly, and the operation of connecting the energy-saving circuit to the relay and disconnecting the conduction circuit from the relay can be executed.

[0029] Furthermore, after the switching conditions are met, the connection operation between the energy-saving circuit and the relay is executed. It is determined whether the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is disconnected. If the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is disconnected, the connection between the conducting circuit and the relay is disconnected, including:

[0030] The microprocessor applies a high level to the gate of the second fully controlled switch device connected to the energy-saving circuit, thereby turning on the energy-saving circuit. After the energy-saving circuit is turned on by the relay, it detects the operating current data of the energy-saving circuit, reduces and converts the obtained operating current data of the energy-saving circuit, and then inputs it into the microprocessor.

[0031] After the microprocessor obtains the converted operating current data of the energy-saving circuit, it determines whether the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is cut off. If the relay can maintain normal operation, the connection between the conducting circuit and the relay is disconnected.

[0032] Furthermore, the calculation formula for reducing and transforming the obtained energy-saving circuit operating current data is as follows:

[0033]

[0034] Where Iinput2 is the obtained energy-saving circuit operating current data; k3 is the third reduction constant; and Ioutput2 is the converted energy-saving circuit operating current data.

[0035] The expression for determining whether the energy-saving circuit can maintain normal relay operation after the conducting circuit is cut off, based on the operating current data of the energy-saving circuit, is as follows:

[0036]

[0037] Wherein, Resulti2 is the judgment result of whether the energy-saving circuit can maintain the normal operation of the relay after the conduction circuit is cut off, and Ib is the minimum holding current for the relay to operate normally. If the judgment result Resulti2 = 1, it means that the energy-saving circuit can maintain the normal operation of the relay after the conduction circuit is cut off. The microprocessor applies a low level to the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the connection between the conduction circuit and the relay. If the judgment result Resulti2 = 0, it means that the energy-saving circuit cannot maintain the normal operation of the relay after the conduction circuit is cut off. The microprocessor applies a low level to the gate of the first fully controlled switch device connected to the conduction circuit and the gate of the second fully controlled switch device connected to the energy-saving circuit to disconnect the connection between the conduction circuit and the relay, and the connection between the energy-saving circuit and the relay.

[0038] Furthermore, the circuit's safe operation is determined based on its output voltage. If the circuit is in an unsafe operating state, the connection between the energy-saving circuit and the relay, and between the conducting circuit and the relay, is disconnected, including:

[0039] The output voltage data of the circuit is acquired using a voltage sensor, and the acquired output voltage data is reduced and converted before being input into the microprocessor;

[0040] After the microprocessor obtains the converted output voltage data, it determines whether the converted output voltage data is within the normal operating voltage range. If it is not within the normal operating voltage range, it disconnects the energy-saving circuit from the relay and the conduction circuit from the relay.

[0041] Furthermore, the calculation formula for reducing and converting the acquired output voltage data is as follows:

[0042]

[0043] Wherein, Uinput1 is the acquired output voltage data; k1 is the first reduction constant; and Uoutput1 is the converted output voltage data.

[0044] The expression for determining whether the converted output voltage data is within the normal operating voltage range is as follows:

[0045]

[0046] Where Resultu is the result of judging whether the output voltage data is normal, and Un is the target output voltage of the circuit. If the result Resultu = 1, it means that the circuit is in a safe operating state and no operation is required. If the result Resultu = 1, it means that the circuit is not in a safe operating state. The microprocessor applies a low level to the gate of the second fully controlled switch device connected to the energy-saving circuit and the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the connection between the energy-saving circuit and the relay, and the connection between the conduction circuit and the relay.

[0047] Compared with existing technologies, the present invention has the following advantages: The present invention provides a high-safety relay energy-saving control method for energy storage devices. This method achieves the purpose of the relay first connecting the conduction circuit and then connecting the energy-saving circuit by controlling power electronic switching devices. While ensuring the normal operation of the relay, it effectively reduces the power consumption of the relay, and by controlling the switching signal of the power electronic switch, it achieves the back-and-forth switching of the conduction circuit to cope with complex situations, thereby improving the safety of circuit operation. Attached Figure Description

[0048] Figure 1 A flowchart of a relay control method for an energy storage device provided in an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the working circuit of the relay in an embodiment of the present invention;

[0050] Figure 3 This is a flowchart illustrating the process of determining the conduction conditions before the conduction circuit and relay are connected in an embodiment of the present invention.

[0051] Figure 4 This is a flowchart illustrating the connection between the conduction circuit and the relay in an embodiment of the present invention;

[0052] Figure 5 This is a flowchart illustrating the connection between the energy-saving circuit and the relay in an embodiment of the present invention;

[0053] Figure 6 This is a flowchart illustrating the circuit safety operation judgment process after the energy-saving circuit and relay are connected in an embodiment of the present invention. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0055] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] Existing methods for reducing relay power consumption mainly involve directly inputting PWM signals to the relay via a microprocessor or using timing circuits to switch the relay's connection to different circuits. The microprocessor outputs a PWM signal to the relay, reducing the average operating current and thus lowering the relay's power consumption. However, this method requires the microprocessor to generate a high-frequency PWM signal, which can place a significant burden on the microprocessor. Using timing circuits allows the relay to be switched from one circuit to another, thereby reducing power consumption through different topologies. However, the timing circuits commonly used in this method are highly susceptible to external environmental influences and have low accuracy.

[0058] This invention provides a high-safety relay energy-saving control method for energy storage devices. By applying the energy-saving control method of circuits with relays to power electronic devices that require relays to connect circuits, it solves the problem of excessive relay power consumption and the problem that the timing circuit of the method of reducing relay power consumption is easily affected by external interference.

[0059] This method determines whether to connect the relay and the conduction circuit by judging whether the output voltage of the power electronic circuit is stable. A microprocessor outputs a signal to the switch connecting the relay and the conduction circuit to connect them, and the relay's operating current is used to determine if the relay is operating normally. Next, the microprocessor outputs a signal to the switch connecting the relay and the energy-saving circuit to connect them, and the energy-saving circuit's operating current is used to determine if it can maintain the relay's normal operation. If the energy-saving circuit can maintain the relay's normal operation independently, the connection between the conduction circuit and the relay is disconnected. After the relay and the energy-saving circuit are connected, the output of the power electronic circuit is used to determine if it is operating within a safe area. If the power electronic circuit is operating within an unsafe area, the connections between the conduction circuit and the relay, and between the energy-saving circuit and the relay, must be disconnected. This method achieves the function of reducing power consumption while ensuring the normal operation of the relay, and the final safety detection enhances the safety of this energy-saving control method.

[0060] Figure 1 A flowchart of the relay control method for the energy storage device provided in this embodiment. Figure 1 As shown, the relay control method for energy storage devices provided in this embodiment includes:

[0061] S1. Collect the output voltage of the circuit and determine whether the circuit has reached the conduction condition based on the output voltage.

[0062] This step mainly uses a voltage sensor to collect the output voltage of the power electronic circuit. The purpose is to determine whether the output of the power electronic circuit is stable by measuring the output voltage, and then decide whether to perform the operation of connecting the conduction circuit and the relay.

[0063] S2. After the conduction conditions are met, the conduction circuit and the relay are connected, and the relay is judged to be working properly based on the operating data.

[0064] Building upon the previous step, this step aims to enable the relay to conduct normally. The relay initially requires a large starting current, and the conduction circuit can provide sufficient current for the relay to turn on, thereby allowing the energy-saving circuit to be connected to the relay while the relay is operating normally.

[0065] S3. After the switching conditions are met, the energy-saving circuit and the relay are connected. It is determined whether the energy-saving circuit can keep the relay running normally after the conducting circuit is cut off. If the energy-saving circuit can keep the relay running normally after the conducting circuit is cut off, the connection between the conducting circuit and the relay is disconnected, so that the relay only works in the energy-saving circuit and its power consumption is reduced.

[0066] Building upon the previous step, this step aims to connect the energy-saving circuit to the relay and disconnect the conducting circuit from the relay while ensuring the relay operates normally, thereby reducing the normal operating losses of the relay.

[0067] Figure 2 This is a schematic diagram of the relay's operating circuit in this embodiment. Figure 2 As shown, when the relay operates in the conducting circuit, assuming the equivalent resistance of the relay is R, then its power consumption in the conducting circuit is p = U. 2 / R. When the relay operates in an energy-saving circuit, its power consumption is P = U. 2 R / (R+R1) 2 The power consumption of the entire circuit is P′=U 2 / (R+R1). It can be seen that, while ensuring the normal operation of the relay, making the relay work only in the energy-saving circuit can effectively reduce the power consumption of the relay and the power consumption of the entire working circuit.

[0068] S4. Determine whether the circuit is operating safely based on the output voltage. If the circuit is in an unsafe operating state, disconnect the energy-saving circuit from the relay and the conduction circuit from the relay.

[0069] Building upon the previous step, this step aims to ensure that the power electronic circuit operates normally after the energy-saving circuit and relay are connected, thereby improving the safety of the energy-saving control method.

[0070] like Figure 3 As shown, the output voltage of the acquisition circuit is used to determine whether the circuit has reached the conduction condition, including:

[0071] The output voltage data of the circuit is acquired using a voltage sensor, and the acquired output voltage data is reduced and converted before being input into the microprocessor. The calculation formula is as follows:

[0072]

[0073] Wherein, Uinput1 is the acquired output voltage data; k1 is the first reduction constant; and Uoutput1 is the converted output voltage data.

[0074] After the microprocessor obtains the converted output voltage data, it determines whether the converted output voltage data is within the normal operating voltage range. The expression for this is as follows:

[0075]

[0076] Where Resultu is the judgment result of whether the output voltage data is normal, and Un is the target output voltage of the circuit. If the judgment result Resultu = 0, it means that the circuit output voltage has not yet stabilized and has not reached the conduction condition, so the connection between the conduction circuit and the relay is not executed. If the judgment result Resultu = 1, it means that the circuit output voltage has stabilized and has reached the conduction condition, so the connection between the conduction circuit and the relay can be executed.

[0077] like Figure 4 As shown, after the conduction condition is met, the connection operation between the conduction circuit and the relay is executed, and the operation data is used to determine whether the relay is working properly, including:

[0078] The microprocessor applies a high level to the gate of the first fully controlled switching device Q1 connected to the conduction circuit, thus turning on the conduction circuit. After the conduction circuit is connected to the relay, the microprocessor detects the relay's operating current data, reduces and converts the acquired relay operating current data, and then inputs it into the microprocessor. The calculation formula is as follows:

[0079]

[0080] Where Iinput1 is the acquired relay operating current data; k2 is the second reduction constant; and Ioutput1 is the converted relay operating current data.

[0081] After the microprocessor obtains the converted relay operating current data, it determines whether the relay is working properly based on the relay operating current data. The expression is as follows:

[0082]

[0083] Here, Resulti1 is the judgment result of whether the relay is working properly; if the judgment result Resulti1 = 0, it means that the relay is not working properly, and the microprocessor will then apply a low level to the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the conduction circuit; if the judgment result Resulti1 = 1, it means that the relay is working properly, and the operation of connecting the energy-saving circuit to the relay and disconnecting the conduction circuit from the relay can be executed.

[0084] like Figure 5 As shown, after the switching conditions are met, the energy-saving circuit and the relay are connected. It is determined whether the energy-saving circuit can maintain the relay's normal operation after the conducting circuit is disconnected. If the energy-saving circuit can maintain the relay's normal operation after the conducting circuit is disconnected, the connection between the conducting circuit and the relay is disconnected, including:

[0085] The microprocessor applies a high level to the gate of the second fully controlled switch Q2 connected to the energy-saving circuit, thus turning on the energy-saving circuit. After the energy-saving circuit is connected to the relay, it detects the operating current data of the energy-saving circuit, reduces and converts the acquired operating current data, and then inputs it into the microprocessor. The calculation formula is as follows:

[0086]

[0087] Where Iinput2 is the obtained energy-saving circuit operating current data; k3 is the third reduction constant; and Ioutput2 is the converted energy-saving circuit operating current data.

[0088] After the microprocessor obtains the converted energy-saving circuit operating current data, it determines whether the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is turned off, based on the energy-saving circuit operating current data. The expression is as follows:

[0089]

[0090] Wherein, Resulti2 is the judgment result of whether the energy-saving circuit can maintain the normal operation of the relay after the conduction circuit is cut off, and Ib is the minimum holding current for the relay to operate normally. If the judgment result Resulti2 = 1, it means that the energy-saving circuit can maintain the normal operation of the relay after the conduction circuit is cut off. The microprocessor applies a low level to the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the connection between the conduction circuit and the relay. If the judgment result Resulti2 = 0, it means that the energy-saving circuit cannot maintain the normal operation of the relay after the conduction circuit is cut off. The microprocessor applies a low level to the gate of the first fully controlled switch device connected to the conduction circuit and the gate of the second fully controlled switch device connected to the energy-saving circuit to disconnect the connection between the conduction circuit and the relay, and the connection between the energy-saving circuit and the relay.

[0091] like Figure 6 As shown, the circuit's safe operation is determined based on its output voltage. If the circuit is in an unsafe operating state, the connection between the energy-saving circuit and the relay, and between the conducting circuit and the relay, is disconnected, including:

[0092] The output voltage data of the circuit is acquired using a voltage sensor, and the acquired output voltage data is reduced and converted before being input into the microprocessor. The calculation formula is as follows:

[0093]

[0094] Wherein, Uinput1 is the acquired output voltage data; k1 is the first reduction constant; and Uoutput1 is the converted output voltage data.

[0095] After the microprocessor obtains the converted output voltage data, it determines whether the converted output voltage data is within the normal operating voltage range. The expression for this is as follows:

[0096]

[0097] Wherein, Resultu is the judgment result of whether the output voltage data is normal, and Un is the target output voltage of the circuit; if the judgment result Resultu = 1, it means that the circuit is in a safe operating state and no operation is required; if the judgment result Resultu = 1, it means that the circuit is not in a safe operating state, and the microprocessor applies a low level to the gate of the second fully controlled switch device connected to the energy-saving circuit and the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the connection between the energy-saving circuit and the relay, and the connection between the conduction circuit and the relay.

[0098] In summary, the relay control method for energy storage devices provided by this invention uses a voltage sensor to collect the output voltage of the power electronic circuit. The collected output voltage data is preprocessed and sent to a microprocessor for judgment, thereby determining whether to connect the conducting circuit to the relay. After connecting the conducting circuit to the relay, it is determined whether the relay is working normally, thereby determining whether to connect the energy-saving circuit to the relay. After connecting the energy-saving circuit to the relay, it is determined whether the energy-saving circuit can independently maintain the relay's normal operation, thereby determining whether to disconnect the conducting circuit from the relay. Finally, the previously collected power electronic circuit output voltage data is preprocessed and sent to the microprocessor for judgment, thereby determining whether to disconnect the conducting circuit from the relay and the energy-saving circuit from the relay. This method fully considers the normal operation of the relay, the reduction of operating losses, and the safety of circuit operation. Using fully controlled devices and a microprocessor improves the anti-interference capability and working accuracy of the energy-saving control method.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A relay control method for an energy storage device, characterized in that, include: The output voltage of the acquisition circuit is collected, and the circuit is judged based on the output voltage to determine whether the circuit has reached the conduction condition. Once the conduction conditions are met, the circuit is connected to the relay, and the relay is judged to be working properly based on the operating data. After the switching conditions are met, the energy-saving circuit and the relay are connected. It is determined whether the energy-saving circuit can keep the relay running normally after the conducting circuit is cut off. If the energy-saving circuit can keep the relay running normally after the conducting circuit is cut off, the connection between the conducting circuit and the relay is disconnected, so that the relay only works in the energy-saving circuit and its power consumption is reduced. Determine whether the circuit is operating safely based on its output voltage. If the circuit is in an unsafe operating state, disconnect the energy-saving circuit from the relay and the conducting circuit from the relay. The output voltage of the acquisition circuit is used to determine whether the circuit has reached the conduction condition, including: The output voltage data of the circuit is acquired using a voltage sensor, and the acquired output voltage data is reduced and converted before being input into the microprocessor; After the microprocessor obtains the converted output voltage data, it determines whether the converted output voltage data is within the normal operating voltage range. If it is, the conduction condition has been met; otherwise, the conduction condition has not been met. The formula for calculating the reduction and conversion of output voltage data is as follows: Wherein, Uinput1 is the acquired output voltage data; k1 is the first reduction constant; and Uoutput1 is the converted output voltage data. The expression for determining whether the converted output voltage data is within the normal operating voltage range is as follows: Where Resultu is the judgment result of whether the output voltage data is normal, and Un is the target output voltage of the circuit; if the judgment result Resultu = 0, it means that the circuit output voltage is not stable and has not reached the conduction condition, and the connection between the conduction circuit and the relay is not executed; if the judgment result Resultu = 1, it means that the circuit output voltage has stabilized and has reached the conduction condition, and the connection between the conduction circuit and the relay can be executed. After the switching conditions are met, the energy-saving circuit and the relay are connected. It is determined whether the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is disconnected. If the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is disconnected, the connection between the conducting circuit and the relay is disconnected, including: The microprocessor applies a high level to the gate of the second fully controlled switch device connected to the energy-saving circuit, thereby turning on the energy-saving circuit. After the energy-saving circuit is turned on by the relay, it detects the operating current data of the energy-saving circuit, reduces and converts the obtained operating current data of the energy-saving circuit, and then inputs it into the microprocessor. After the microprocessor obtains the converted operating current data of the energy-saving circuit, it determines whether the energy-saving circuit can maintain the normal operation of the relay after the conducting circuit is cut off. If the relay can maintain normal operation, the connection between the conducting circuit and the relay is disconnected.

2. The relay control method for an energy storage device according to claim 1, characterized in that, After the conduction conditions are met, the connection operation between the conduction circuit and the relay is executed, and the normal operation of the relay is determined based on the operating data, including: The microprocessor applies a high level to the gate of the first fully controlled switching device connected to the conduction circuit, thereby turning on the conduction circuit. After the conduction circuit is connected to the relay, the microprocessor detects the relay's operating current data, reduces and converts the acquired relay operating current data, and then inputs it into the microprocessor. After the microprocessor obtains the converted relay operating current data, it determines whether the relay is working properly based on the relay operating current data.

3. The relay control method for an energy storage device according to claim 2, characterized in that, The calculation formula for reducing and converting the acquired relay operating current data is as follows: Where Iinput1 is the acquired relay operating current data; k2 is the second reduction constant; and Ioutput1 is the converted relay operating current data. The expression for determining whether a relay is working properly based on its operating current data is as follows: Wherein, Resulti1 is the judgment result of whether the relay is working properly; if the judgment result Resulti1 = 0, it means that the relay is not working properly, and the microprocessor will then apply a low level to the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the conduction circuit; if the judgment result Resulti1 = 1, it means that the relay is working properly, and the operation of connecting the energy-saving circuit and the relay and disconnecting the conduction circuit and the relay can be executed.

4. The relay control method for an energy storage device according to claim 1, characterized in that, The calculation formula for reducing and converting the obtained energy-saving circuit operating current data is as follows: Where Iinput2 is the obtained energy-saving circuit operating current data; k3 is the third reduction constant; and Ioutput2 is the converted energy-saving circuit operating current data. The expression for determining whether the energy-saving circuit can maintain normal relay operation after the conducting circuit is cut off, based on the operating current data of the energy-saving circuit, is as follows: Wherein, Resulti2 is the judgment result of whether the energy-saving circuit can maintain the normal operation of the relay after the conduction circuit is cut off, and Ib is the minimum holding current for the relay to operate normally. If the judgment result Resulti2 = 1, it means that the energy-saving circuit can maintain the normal operation of the relay after the conduction circuit is cut off. The microprocessor applies a low level to the gate of the first fully controlled switch device connected to the conduction circuit to disconnect the connection between the conduction circuit and the relay. If the judgment result Resulti2 = 0, it means that the energy-saving circuit cannot maintain the normal operation of the relay after the conduction circuit is cut off. The microprocessor applies a low level to the gate of the first fully controlled switch device connected to the conduction circuit and the gate of the second fully controlled switch device connected to the energy-saving circuit to disconnect the connection between the conduction circuit and the relay, and the connection between the energy-saving circuit and the relay.

5. The relay control method for an energy storage device according to claim 1, characterized in that, Determine if the circuit is operating safely based on its output voltage. If the circuit is in an unsafe operating state, disconnect the energy-saving circuit from the relay and the conducting circuit from the relay, including: The output voltage data of the circuit is acquired using a voltage sensor, and the acquired output voltage data is reduced and converted before being input into the microprocessor; After the microprocessor obtains the converted output voltage data, it determines whether the converted output voltage data is within the normal operating voltage range. If it is not within the normal operating voltage range, it disconnects the energy-saving circuit from the relay and the conduction circuit from the relay.

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