A magnetic latching relay protection device, method, and portable energy storage system

Abstract

The application discloses a kind of magnetic latching relay protection device, method and portable energy storage system.The device includes: pulse signal output module and coil protection module;The pulse signal output module is used to output pulse signal to the coil of external magnetic latching relay to make the external magnetic latching relay action;The coil protection module is used to make the current time flowing through the coil to be kept as preset time to protect the coil when detecting relay action feedback signal;Wherein, the pulse width time of the pulse signal is the preset time.This scheme maintains the pulse width time of pulse signal unchanged during the action of magnetic latching relay, thereby avoiding causing coil heating, and then avoiding coil burnout, to achieve the protection of magnetic latching relay.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a magnetic latching relay protection device, method, and portable energy storage system. Background Technology

[0002] Currently used portable energy storage distribution boxes require switching between the AC power supplied by the portable energy storage and the AC power supplied by the mains. The current switching solutions primarily use magnetic latching relays. However, the control requirements for magnetic latching relay coils are very precise, generally requiring accurate pulse signal control, typically in the millisecond range. During relay operation, if the pulse width is too long, it will cause the coil to overheat and burn out, leading to the entire relay malfunctioning and causing product abnormalities. This results in cost and user experience issues. Therefore, there is an urgent need to solve the problem of coil overheating due to excessively long control pulse signal duration, which can lead to control abnormalities or burnout. Summary of the Invention

[0003] This invention provides a magnetic latching relay protection device, method, and portable energy storage system to maintain a constant pulse width and duration of the pulse signal during the operation of the magnetic latching relay, thereby preventing the coil from overheating and burning out, thus achieving protection for the magnetic latching relay.

[0004] To achieve the above objectives, in a first aspect, embodiments of the present invention provide a magnetic latching relay protection device, which includes: a pulse signal output module and a coil protection module;

[0005] The pulse signal output module is used to output a pulse signal to the coil of the external magnetic latching relay to activate the external magnetic latching relay.

[0006] The coil protection module is used to protect the coil by maintaining the current flowing through the coil for a preset time after detecting a relay action feedback signal; wherein the pulse width of the pulse signal is the preset time.

[0007] Optionally, the coil protection module includes: a pulse signal detection unit and a pulse signal adjustment unit;

[0008] The pulse signal detection unit is used to detect whether the pulse signal is maintained at the switching level after the relay action feedback signal is detected;

[0009] The pulse signal adjustment unit is used to adjust the pulse signal to maintain it at the transition level when the pulse signal is not maintained at the transition level.

[0010] Optionally, the coil protection module includes: a negative temperature coefficient resistor unit;

[0011] The negative temperature coefficient resistor unit is connected in series between the coil and the voltage source.

[0012] Optionally, the negative temperature coefficient resistor unit may include one or more PTC resistors.

[0013] Optionally, the coil protection module includes: a pulse signal detection unit and a coil power supply branch protection unit;

[0014] The pulse signal detection unit is used to detect whether the pulse signal is maintained at the switching level after detecting the relay action feedback signal, and to output a control signal to the coil power supply branch protection unit when it is detected that the pulse signal is not maintained at the switching level.

[0015] The coil power supply branch protection unit is used to start working when the control signal is received.

[0016] Optionally, the coil power supply branch protection unit includes a switching assembly;

[0017] The switching assembly is connected in series between the coil and the voltage source.

[0018] Optionally, the pulse signal detection unit is further configured to detect whether the pulse signal is maintained at the transition level multiple times after adjusting the pulse signal to be maintained at the transition level for a preset time.

[0019] An alarm signal is output when the pulse signal fails to maintain the switching level multiple times.

[0020] Secondly, embodiments of the present invention also provide a portable energy storage system, which includes the magnetic latching relay protection device described in the first aspect; and further includes: a magnetic latching relay body; the magnetic latching relay body includes: a first coil, a second coil, and a relay contact switch;

[0021] The main contact of the relay contact switch is connected to the load interface; the first switch contact of the relay contact switch is electrically connected to the first power supply port; the second switch contact of the relay contact switch is electrically connected to the second power supply port; the first coil is coupled to the first switch contact of the relay contact switch; the second coil is coupled to the second switch contact of the relay contact switch.

[0022] The magnetic latching relay protection device is used to protect the first coil or the second coil; when the magnetic latching relay protection device includes a negative temperature coefficient resistor unit, the negative temperature coefficient resistor unit is connected in series between the common output terminal of the first coil and the second coil and the voltage source.

[0023] Thirdly, embodiments of the present invention also provide a magnetic latching relay protection method, the method comprising:

[0024] The pulse signal output module outputs a pulse signal to the coil of the external magnetic latching relay to activate the external magnetic latching relay;

[0025] When the coil protection module detects a relay action feedback signal, it maintains the current flowing through the coil for a preset time to protect the coil; wherein, the pulse width of the pulse signal is the preset time.

[0026] Optionally, the coil protection module includes: a pulse signal detection unit and a pulse signal adjustment unit;

[0027] Upon detecting a relay action feedback signal, the coil protection module maintains the current flowing through the coil for a preset time to protect the coil, including:

[0028] After detecting the relay action feedback signal, the pulse signal detection unit detects whether the pulse signal is maintained at the switching level.

[0029] When the pulse signal is not maintained at the transition level, the pulse signal adjustment unit adjusts the pulse signal to maintain at the transition level.

[0030] In this embodiment of the invention, a pulse signal is output to the coil of an external magnetic latching relay via a pulse signal output module, thereby causing the external magnetic latching relay to operate. When a relay operation feedback signal is detected, the coil protection module maintains the current flowing through the coil for a preset time to protect the coil. The pulse width of the pulse signal is set to the preset time, thus maintaining the pulse width of the pulse signal unchanged during the operation of the magnetic latching relay, thereby preventing the coil from overheating and burning out, and achieving protection for the magnetic latching relay.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a magnetic latching relay protection device provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of another magnetic latching relay protection device provided in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of another magnetic latching relay protection device provided in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of another magnetic latching relay protection device provided in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of another magnetic latching relay protection device provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of another magnetic latching relay protection device provided in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of another magnetic latching relay protection device provided in an embodiment of the present invention;

[0040] Figure 8 This is a schematic diagram of the structure of a portable energy storage system provided in an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of another portable energy storage system provided in an embodiment of the present invention;

[0042] Figure 10 This is a schematic flowchart of a magnetic latching relay protection method provided in an embodiment of the present invention;

[0043] Figure 11 This is a schematic flowchart of another magnetic latching relay protection method provided in an embodiment of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] Figure 1 This is a schematic diagram of the structure of a magnetic latching relay protection device provided in an embodiment of the present invention; as shown. Figure 1 As shown, the magnetic latching relay protection device includes: a pulse signal output module 10 and a coil protection module 20; the pulse signal output module 10 is used to output a pulse signal to the coil of the external magnetic latching relay to make the external magnetic latching relay operate; the coil protection module 20 is used to protect the coil by keeping the current flowing through the coil for a preset time after detecting the relay operation feedback signal; wherein, the pulse width time of the pulse signal is the preset time.

[0047] In this embodiment, the pulse signal output module 10 can output a pulse signal to the coil of the external magnetic latching relay, generating a magnetic field within the coil, thereby driving the external magnetic latching relay to operate. The positive or negative sign of the pulse signal can be determined according to the specific operating command of the external magnetic latching relay. For example, when the external magnetic latching relay needs to go from open to closed, the pulse signal output module 10 can output a positive pulse signal to the coil of the external magnetic latching relay, thereby causing the external magnetic latching relay to go from open to closed; when the external magnetic latching relay needs to go from open to closed, the pulse signal output module 10 can output a negative pulse signal to the coil of the external magnetic latching relay, thereby causing the external magnetic latching relay to go from closed to operated.

[0048] The coil protection module 20, upon detecting a relay action feedback signal, maintains the current flowing through the coil for a preset time, which is the pulse width of the pulse signal, thereby protecting the coil. This avoids the problem that, during the actual operation of the magnetic latching relay, the current flowing through the coil cannot be maintained within the pulse width of the pulse signal, which would cause the coil to overheat and burn out, ultimately preventing the entire magnetic latching relay from continuing to operate. The relay action feedback signal can be a feedback signal indicating the actual physical position of the relay contacts being closed, or a feedback signal indicating the actual physical position of the relay contacts being open; that is, during each of the above operations, the coil protection module 20 can maintain the current flowing through the coil for the preset time.

[0049] It should be noted that in this embodiment, the coil protection module 20 can be implemented by software, physical hardware circuit, or a combination of software and physical hardware circuit. No specific limitation is made on the specific type of the coil protection module 20.

[0050] In this embodiment of the invention, the coil protection module 20 ensures that the pulse width and duration of the pulse signal remain constant during the operation of the magnetic latching relay, thereby preventing the coil from overheating and burning out, thus protecting the magnetic latching relay.

[0051] Optionally, based on the above embodiments, the coil protection module 20 is further described in detail. Figure 2 This is a schematic diagram of the specific structure of a magnetic latching relay protection device provided in an embodiment of the present invention; as shown below. Figure 2 As shown, in some embodiments, the coil protection module 20 includes: a pulse signal detection unit 21 and a pulse signal adjustment unit 22; the pulse signal detection unit 21 is used to detect whether the pulse signal is maintained at the switching level after detecting the relay action feedback signal; the pulse signal adjustment unit 22 is used to adjust the pulse signal to maintain at the switching level when the pulse signal is not maintained at the switching level.

[0052] The pulse signal detection unit 21 can be implemented by software and / or hardware; the pulse signal adjustment unit 22 can also be implemented by software and / or hardware. Specifically, when the pulse signal is a positive pulse signal (a positive pulse signal is a high-level transition to a low-level signal), the pulse signal detection unit 21, after detecting the relay action feedback signal, can detect whether the pulse signal at the output pin of the pulse signal output module 10 remains at a low level; when the pulse signal is detected as not remaining at a low level, the pulse signal adjustment unit 22 adjusts the pulse signal to remain at a low level; when the pulse signal is a negative pulse signal (a negative pulse signal is a low-level transition to a high level), the pulse signal... After detecting the relay action feedback signal, the signal detection unit 21 can detect whether the pulse signal of the output pin of the pulse signal output module 10 is maintained at a high level. When the pulse signal is detected as not being maintained at a high level, the pulse signal adjustment unit 22 adjusts the pulse signal to maintain a high level. Thus, when the pulse signal is not maintained at the transition level, the pulse signal adjustment unit 22 can adjust the pulse signal to maintain the transition level, thereby keeping the pulse width and time of the pulse signal unchanged. This ensures that the current flowing through the coil is maintained for a preset time, thus avoiding the problem of the coil burning out due to the current flowing through the coil for too long during the above-mentioned operation of the magnetic latching relay.

[0053] Optionally, in other embodiments, the coil protection module 20 may also be implemented solely by hardware circuitry; Figure 3 This is a schematic diagram of the specific structure of another magnetic latching relay protection device provided in an embodiment of the present invention; as shown below. Figure 3 As shown, the coil protection module 20 includes: a negative temperature coefficient resistor unit 23; the negative temperature coefficient resistor unit 23 is connected in series between the coil Q and the voltage source VCC.

[0054] The negative temperature coefficient resistor unit 23 is a unit whose resistance value gradually increases with increasing temperature. This embodiment does not limit the specific configuration of the negative temperature coefficient resistor unit 23. The negative temperature coefficient resistor unit 23 is connected in series between the coil Q and the voltage source VCC. When the pulse width of the pulse signal is too long, the current flowing through the coil increases, causing the temperature in the coil branch to gradually rise. This gradually increases the resistance of the negative temperature coefficient resistor unit 23, thus reducing the current in the coil branch and ensuring that the current flowing through the coil remains within the pulse width of the pulse signal. This avoids the problem of the magnetic latching relay burning out due to excessively long current flowing through the coil during the above-mentioned operation.

[0055] Optional, Figure 4 This is a schematic diagram of the specific structure of another magnetic latching relay protection device provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the specific structure of another magnetic latching relay protection device provided in an embodiment of the present invention; as shown below. Figures 4-5As shown, the negative temperature coefficient resistor unit 23 further includes one or more PTC resistors.

[0056] The negative temperature coefficient resistor unit 23 may include one or more PTC resistors; the multiple PTC resistors may be connected in parallel or in series; the overcurrent capacity of the single PTC resistor or multiple PTC resistors may be less than the current flowing through the coil; this will not cause the PTC resistor or multiple PTC resistors to change resistance abruptly within the pulse width time.

[0057] Optionally, in some other embodiments, the coil protection module 20 may also be implemented in other ways; Figure 6 This is a schematic diagram of the specific structure of a magnetic latching relay protection device provided in an embodiment of the present invention; in other embodiments, such as Figure 6 As shown, the coil protection module 20 includes: a pulse signal detection unit 21 and a coil power supply branch protection unit 24; the pulse signal detection unit 21 is used to detect whether the pulse signal is maintained at the switching level after detecting the relay action feedback signal, and output a control signal to the coil power supply branch protection unit 24 when the pulse signal is not maintained at the switching level; the coil power supply branch protection unit 24 is used to start working when the control signal is received.

[0058] The pulse signal detection unit 21 can be implemented by software and / or hardware; the coil power supply branch protection unit 24 can be implemented by hardware circuit only; its specific composition is not limited; in this embodiment, the pulse signal detection unit 21 detects whether the pulse signal is maintained at the transition level, and when the pulse signal is not maintained at the transition level, it outputs a control signal to the coil power supply branch protection unit 24; the coil power supply branch protection unit 24 starts working when it receives the control signal, thereby disconnecting the power supply to the coil, thus ensuring that the current flowing through the coil is kept at the pulse width time of the pulse signal; this avoids the problem of the magnetic latching relay burning out due to the current flowing through the coil for too long during the above operation.

[0059] Optional, Figure 7 This is a schematic diagram of the specific structure of another magnetic latching relay protection device provided in an embodiment of the present invention; as shown below. Figure 7 As shown, the coil power supply branch protection unit 24 further includes a switch assembly 241; the switch assembly 241 is connected in series between the coil Q and the voltage source VCC.

[0060] The coil power supply branch protection unit 24 includes a switching component 241. When the pulse signal is detected to be not maintained at the switching level, the pulse signal detection unit 21 outputs a control signal to the switching component 241, and the switching component 241 disconnects upon receiving the control signal, thus achieving protection of the coil.

[0061] Optional, continue to refer to Figure 2 The pulse signal detection unit 21 is further configured to detect whether the pulse signal remains at the transition level multiple times after a preset time has elapsed since the adjustment of the pulse signal. When the pulse signal fails to remain at the transition level multiple times, an alarm signal is output. Specifically, when the pulse signal fails to remain at the transition level multiple times, that is, when the current flowing through the coil reaches an uncontrollable state, an alarm signal is output, thus improving the reliability of the warning. Preferably, multiple failures to remain at the transition level include three failures.

[0062] Based on the same inventive concept, this invention also provides a portable energy storage system, the method including the magnetic latching relay protection device 01 of the above embodiments; Figure 8 This is a schematic diagram of the structure of a portable energy storage system provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of another portable energy storage system provided in an embodiment of the present invention; as shown. Figures 8-9 As shown, the portable energy storage system also includes: a magnetic latching relay body 02; the magnetic latching relay body 02 includes: a first coil Q1, a second coil Q2, and a relay contact switch SW; the main contact O of the relay contact switch SW is connected to the load interface; the first switch contact A of the relay contact switch SW is electrically connected to the first power supply port; the second switch contact B of the relay contact switch SW is electrically connected to the second power supply port; the first coil Q1 is coupled to the first switch contact A of the relay contact switch SW; the second coil Q2 is coupled to the second switch contact B of the relay contact switch SW.

[0063] The magnetic latching relay protection device 01 is used to protect either the first coil Q1 or the second coil Q2. When the magnetic latching relay protection device 01 includes a negative temperature coefficient resistor unit 23, the negative temperature coefficient resistor unit 23 is connected in series between the common output terminal of the first coil Q1 and the second coil Q2 and the voltage source VCC (see...). Figure 9 ).

[0064] The device includes a first power port that can receive a first power source, which can be AC ​​power; a second power port that can receive a second power source, which can be an energy storage power source; a load port that can be connected to a home load network; and a magnetic latching relay body 02 that can control the switching of the first or second power source to the home load network. Specifically, the pulse signal output module 10 in the magnetic latching relay protection device 01 can include a switching transistor. The pulse signal output module 10 outputs a positive pulse signal to the first coil Q1. The main contact O of the relay contact switch SW is connected to the first switch contact A, thus switching the first power source to the home load network. After the household load network is connected, the coil protection module 02 can protect the first coil Q1. When the main contact O of the relay contact switch SW is disconnected from the first switch contact A, the pulse signal output module 10 outputs a positive pulse signal to the second coil Q2, and the main contact O of the relay contact switch SW is connected to the second switch contact B, thus switching the second power supply to the household load network. After switching the energy storage power supply to the household load network, the coil protection module 02 can also protect the second coil Q2. In this way, through the magnetic latching relay protection device 01, the stability and reliability of the portable energy storage system in switching power supply to the household load network are achieved.

[0065] Based on the same inventive concept, this invention also provides a magnetic latching relay protection method, which can be applied to the magnetic latching relay protection device described above. Figure 10 This is a flowchart illustrating a magnetic latching relay protection method provided in an embodiment of the present invention; as shown below. Figure 10 As shown, the method includes the following steps:

[0066] S110, the pulse signal output module outputs a pulse signal to the coil of the external magnetic latching relay to activate the external magnetic latching relay.

[0067] S120: When the coil protection module detects the relay action feedback signal, it keeps the current flowing through the coil for a preset time to protect the coil; wherein, the pulse width time of the pulse signal is the preset time.

[0068] In this embodiment of the invention, the coil protection module ensures that the pulse width and duration of the pulse signal remain constant during the operation of the magnetic latching relay, thereby preventing the coil from overheating and burning out, thus protecting the magnetic latching relay.

[0069] Optionally, the above method embodiments can be further refined based on the composition of the coil protection module. Specifically, the coil protection module includes a pulse signal detection unit and a pulse signal adjustment unit. Figure 11 This is a flowchart illustrating another magnetic latching relay protection method provided in an embodiment of the present invention; as shown. Figure 11As shown, the method includes the following steps:

[0070] S210, the pulse signal output module outputs a pulse signal to the coil of the external magnetic latching relay to activate the external magnetic latching relay.

[0071] S220: After detecting the relay action feedback signal, the pulse signal detection unit detects whether the pulse signal is maintained at the switching level.

[0072] S230. When the pulse signal is not maintained at the transition level, the pulse signal adjustment unit adjusts the pulse signal to maintain at the transition level.

[0073] In this embodiment of the invention, after the pulse signal detection unit detects the relay action feedback signal, it detects whether the pulse signal is maintained at the transition level. When the pulse signal is not maintained at the transition level, the pulse signal adjustment unit adjusts the pulse signal to maintain the transition level, thus ensuring that the current flowing through the coil is kept at the pulse width of the pulse signal. This avoids the problem of the magnetic latching relay burning out due to the current flowing through the coil for too long during the above-mentioned operation.

[0074] Optionally, the method further includes: after adjusting the pulse signal to maintain at the transition level for a preset time, the pulse signal detection unit repeatedly detects whether the pulse signal is maintained at the transition level; when the pulse signal fails to maintain at the transition level multiple times, an alarm signal is output.

[0075] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A magnetic latching relay protection device, characterized in that, include: Pulse signal output module and coil protection module; The pulse signal output module is used to output a pulse signal to the coil of the external magnetic latching relay to activate the external magnetic latching relay. The coil protection module is used to protect the coil by maintaining the current flowing through the coil for a preset time after detecting a relay action feedback signal; wherein the pulse width of the pulse signal is the preset time. The coil protection module includes: a pulse signal detection unit and a pulse signal adjustment unit; The pulse signal detection unit is used to detect whether the pulse signal is maintained at the switching level after the relay action feedback signal is detected; The pulse signal adjustment unit is used to adjust the pulse signal to maintain it at the transition level when the pulse signal is not maintained at the transition level. Alternatively, the coil protection module may include: a pulse signal detection unit and a coil power supply branch protection unit; The pulse signal detection unit is used to detect whether the pulse signal is maintained at the switching level after detecting the relay action feedback signal, and to output a control signal to the coil power supply branch protection unit when it is detected that the pulse signal is not maintained at the switching level. The coil power supply branch protection unit is used to start working when the control signal is received.

2. The magnetic latching relay protection device according to claim 1, characterized in that, The coil power supply branch protection unit includes a switching assembly; The switching assembly is connected in series between the coil and the voltage source.

3. The magnetic latching relay protection device according to claim 1, characterized in that, The pulse signal detection unit is also used to detect whether the pulse signal is maintained at the transition level multiple times after adjusting the pulse signal to be maintained at the transition level for a preset time. An alarm signal is output when the pulse signal fails to maintain the switching level multiple times.

4. A portable energy storage system, characterized in that, The magnetic latching relay protection device includes any one of claims 1-3; it further includes: a magnetic latching relay body; the magnetic latching relay body includes: a first coil, a second coil, and a relay contact switch; The main contact of the relay contact switch is connected to the load interface; the first switch contact of the relay contact switch is electrically connected to the first power supply port; the second switch contact of the relay contact switch is electrically connected to the second power supply port; the first coil is coupled to the first switch contact of the relay contact switch; the second coil is coupled to the second switch contact of the relay contact switch. The magnetic latching relay protection device is used to protect either the first coil or the second coil.

5. A method for protecting a magnetic latching relay, characterized in that, Applied to the magnetic latching relay protection device according to any one of claims 1-3 above; The magnetic latching relay protection method includes: The pulse signal output module outputs a pulse signal to the coil of the external magnetic latching relay to activate the external magnetic latching relay; When the coil protection module detects a relay action feedback signal, it maintains the current flowing through the coil for a preset time to protect the coil; wherein, the pulse width of the pulse signal is the preset time.

6. The magnetic latching relay protection method according to claim 5, characterized in that, The coil protection module includes: a pulse signal detection unit and a pulse signal adjustment unit; Upon detecting a relay action feedback signal, the coil protection module maintains the current flowing through the coil for a preset time to protect the coil, including: After detecting the relay action feedback signal, the pulse signal detection unit detects whether the pulse signal is maintained at the switching level. When the pulse signal is not maintained at the transition level, the pulse signal adjustment unit adjusts the pulse signal to maintain at the transition level.

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