WO2017167079A1

WO2017167079A1 - Power supply circuit and negative surge protection method

Info

Publication number: WO2017167079A1
Application number: PCT/CN2017/077566
Authority: WO
Inventors: 李恒城
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-03-30
Filing date: 2017-03-21
Publication date: 2017-10-05
Also published as: CN107294365A

Abstract

Provided are a power supply circuit and a negative surge protection method. The method comprises: detecting whether a current direction of an object under detection (311) in a power supply circuit (31) is abnormal (S901); sending a control signal if the current direction is abnormal (S902); and releasing pre-stored energy into the power supply circuit according to the control signal (S903). According to the invention, a detection circuit (321) is used to detect whether a current direction of an object under detection in a power supply circuit is abnormal; and if it is detected that the current direction is abnormal, a control circuit (323) connects an energy storage circuit (322) to the power supply circuit, so that the energy storage circuit releases pre-stored energy into the power supply circuit. This prevents a voltage drop caused by a negative surge in the power supply circuit, and helps withstand a negative surge to ensure normal power supply without employing an anti-reverse diode or an anti-reverse MOS transistor.

Description

Power supply circuit and negative surge protection method

Technical field

The present invention relates to the field of electronic devices, and in particular, to a power supply circuit and a negative surge protection method.

Background technique

With the development of society, people's life rhythm tends to be rapid: rapid access to outside information, rapid processing of acquired information, and rapid transmission of information to the outside world have become essential qualities for modern people. In the case of relying on electronic communication devices in this way, the user's requirements for the reliability of the communication device are naturally higher and higher. Once the communication network is interrupted for a short time, in addition to causing a large-scale complaint, it will cause immeasurable economic losses.

In areas with more mountainous areas and more lightning strikes, the system is often restarted due to lightning strikes. This is due to the large negative surge in the power supply system caused by lightning strikes, and the negative surge will reverse the input of the storage capacitors. The energy causes the input "high voltage DC-low voltage DC", that is, the DC-DC circuit outputs power down due to undervoltage, causing the entire power supply system to be powered down and restarted. In order to avoid causing losses to users, more and more communication devices require that the power supply system cannot be powered down in the event of a lightning surge. Therefore, it is especially important for lightning surges, especially for negative lightning surges.

In practical applications, many communication DC power supply systems use two-stage protection to deal with negative surges. Among them, for the second-level protection measures, the more common method is to use Transient Voltage Suppressor (TVS) as the first. Fine protection at the second level. For the first stage, pressure sensitivity is generally used for rough protection. As shown in Fig. 1, an anti-reverse diode is provided at the input end, and the diode is only allowed to flow in a single direction to prevent negative surge. This type of setting is often used in applications where the power is relatively small, and it is convenient to cut off the path of the negative surge, thereby preventing the negative surge from pumping back the energy of the input storage capacitor. For applications with large power consumption, the heat consumption of the diode is relatively large, which can not meet the requirements of normal operation. At this time, a metal-oxide-resistant semiconductor (Metal-Oxide-Semiconductor, MOS for short) is generally provided. The tube replaces the anti-reverse diode for the first-level protection. As shown in Fig. 2, the protection principle of the MOS tube for the negative surge is: when the arrival of the negative surge is detected, a control signal is generated to close the MOS tube, thereby cutting off the negative direction. The surge reverses the path of the energy stored in the capacitor to prevent the negative surge.

However, in practical engineering applications, some power supply systems are not equipped with anti-reverse diodes and anti-reverse MOS tubes, so the protection against negative surges is not well performed. How to protect against negative surges without anti-reverse diodes and anti-reverse MOS tubes, to ensure that the DC-DC circuit does not lose power is a problem that needs to be solved.

Summary of the invention

The main technical problem to be solved by the present invention is to provide a power supply circuit for protecting against negative surges without using anti-reverse diodes and anti-reverse MOS tubes.

In order to solve the above technical problem, a preferred embodiment of the present invention provides a power supply circuit including a power supply loop and a negative surge protection circuit; the power supply loop includes a detected object; and the negative surge protection circuit includes a detection circuit and a storage Energy circuit and control circuit;

The detecting circuit is configured to detect whether an abnormal change occurs in a current direction flowing through the detected object, and send a control signal to the control circuit when an abnormal change occurs in a current direction;

The control circuit is configured to communicate the energy storage circuit and the power supply circuit according to the control signal;

The energy storage circuit is configured to pre-store energy and release pre-stored energy into the power supply loop when it is in communication with the power supply circuit.

In an embodiment of the invention, the detected object is a linear element in the power supply loop.

In an embodiment of the invention, there is further included a secondary protection circuit coupled to the power supply loop, the secondary protection circuit configured to absorb a negative surge in the power supply loop.

In an embodiment of the invention, the energy storage circuit comprises any one of the following two types:

a rechargeable energy storage circuit, the charging energy storage circuit comprising a charging circuit and an energy storage device, The charging line is connected to the charging power source and the energy storage device to charge the energy storage device;

A non-rechargeable energy storage circuit includes a battery pack.

In an embodiment of the invention, the energy storage device of the rechargeable energy storage circuit is any one of the following two types:

Single branch type, comprising an energy storage branch, wherein the energy storage branch includes at least one capacitor;

The multi-branch type includes a plurality of energy storage branches connected in parallel, each of the energy storage branches including at least one capacitor.

In an embodiment of the present invention, the charging line is connected to the charging power source and the energy storage device is specifically: the charging circuit is connected to the power supply circuit, and the energy of the power supply circuit is obtained as the energy storage device. Charging.

In an embodiment of the present invention, the rechargeable energy storage circuit further includes a boosting device, the boosting device and the energy storage device are connected in parallel, and the voltage of the energy storage device is higher than the Power supply loop voltage.

A preferred embodiment of the present invention also provides a negative surge protection method, including:

Detecting whether an abnormal change occurs in the direction of the current of the detected object in the power supply loop;

When the current direction changes abnormally, a control signal is issued;

The pre-stored energy is released into the power supply circuit in accordance with the control signal.

In an embodiment of the present invention, the releasing the pre-stored energy into the power supply circuit according to the control signal further includes: pre-storing energy; the manner of pre-storing energy includes any one of the following two One:

Using a charging line to connect the charging power source and the energy storage device, and using the energy of the charging power source to charge the energy storage device;

The non-rechargeable energy storage circuit is pre-stored with energy, and the non-rechargeable energy storage circuit includes a battery pack.

In an embodiment of the invention, the energy storage device is any one of the following two types:

In an embodiment of the invention, when the charging power source and the energy storage device are connected by using a charging line, and the energy of the charging power source is used to charge the energy storage device, the charging power source is the power supply circuit.

In an embodiment of the present invention, when the charging power source and the energy storage device are connected by using the charging line, and the energy of the charging power source is used to charge the energy storage device, the voltage of the energy storage device is further increased. The voltage of the energy storage device is made higher than the voltage of the power supply circuit.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium includes a stored program, wherein the device in which the storage medium is located controls the operation of the negative surge protection method described above while the program is running.

According to still another embodiment of the present invention, there is further provided a processor for running a program, wherein the program is operative to perform the operation of the negative surge protection method described above.

The beneficial effects of the invention are:

The power supply circuit provided by the preferred embodiment of the present invention detects whether the current direction of the detected object in the power supply loop changes abnormally by using the detecting circuit. When detecting the abnormal change of the current direction, the control circuit connects the energy storage circuit and the power supply circuit. So that the energy storage circuit releases its pre-stored energy into the power supply circuit to avoid the voltage drop caused by the negative surge in the power supply circuit, thereby enabling the anti-reverse diode and the anti-reverse MOS tube to be provided without the anti-reverse diode and the anti-reverse MOS tube Protect against negative surge protection and normal power supply.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a circuit diagram of a prior art with a negative surge protection function;

2 is a circuit diagram of another prior art with a negative surge protection function;

3 is a schematic diagram of a power supply circuit according to Embodiment 1 of the present invention;

4 is a schematic diagram of a charging energy storage circuit according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of another charging type energy storage circuit according to Embodiment 1 of the present invention; FIG.

FIG. 6 is a schematic diagram of a power supply circuit according to Embodiment 1 of the present invention; FIG.

FIG. 7 is a schematic diagram of another power supply circuit according to Embodiment 1 of the present invention; FIG.

FIG. 8 is a schematic diagram of still another power supply circuit according to Embodiment 1 of the present invention; FIG.

FIG. 9 is a flowchart of a negative surge protection method according to Embodiment 2 of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

The power supply circuit and the negative surge protection method provided by the invention aim to ensure that the power supply circuit is not affected by the negative surge and the power is turned off without providing the anti-reverse diode and the anti-anti-MOS tube, in order to make the power supply circuit The advantages of the present invention are more prominent and the details are more clearly described. The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

The present embodiment provides a detailed description of the power supply circuit provided by the present invention. Referring to FIG. 3, the power supply circuit provided in this embodiment includes a power supply circuit 31 and a negative surge protection circuit 32. The power supply circuit 31 belongs to a common power supply circuit, and includes The detection target 311, the detected object 311 is in the power supply circuit 31, and the direction of the current flowing through the detected object 311 can characterize the current direction of the power supply circuit 31. The negative surge protection circuit 32 includes a detection circuit 321, a storage circuit 322, and Control circuit 323.

The detecting circuit 321 is arranged to detect whether an abnormal change occurs in the direction of the current of the detected object 311, where the abnormal change refers to the direction in which the operating current flowing through the detected object 311 at a certain time and the normal operation of the power supply circuit 31 flow through the The current of the detection object 311 is reversed. When the abnormal direction of the current direction of the detected object 311 is detected, it indicates that a negative surge has occurred in the power supply circuit 31, and the intervention of the negative surge protection circuit 32 is required to ensure the normal operation of the power supply circuit. At this time, the detection circuit 321 sends a control signal to the control circuit 323, and the control circuit 323 connects the energy storage circuit 322 and the power supply circuit 31, and causes the energy storage circuit 322 to release its pre-stored energy into the power supply circuit 31 to offset the negative The voltage of the power supply circuit 31 brought to the surge is lowered.

The detected object 311 detected by the detecting circuit 321 may be a linear element in the power supply circuit 31. In the present embodiment, the MOS transistor in the power supply circuit 31 is selected as the object to be detected, and the MOS tube is selected mainly because of the power supply circuit. The slow start circuit is generally provided in the middle, and the MOS transistor is a very common device in the slow start circuit. Alternatively, you can select those linear components in series with the slow-start MOS transistor.

The object to be detected 311 detected by the detection circuit 321 is intended to determine the direction of the current flowing through the object 311 to be detected. Therefore, it should be possible for those skilled in the art to obtain the detection circuit 321 without any doubt. The operational parameters of the detection object 311 may be various as long as the operational parameters can finally reflect the direction of the current flowing through the detected object 311. The direction of the current can be reflected by many parameters. In addition to the positive and negative of the current value, there is a positive or negative voltage value across the detected object 311. Therefore, the detection operating parameter can be either current or voltage.

Referring to FIG. 4-5, the energy storage circuit 322 includes two types: a rechargeable energy storage circuit 322' and a non-rechargeable energy storage circuit 322. When the energy storage circuit 322 is disposed, the storage circuit 322 can be configured in any form, for example, The energy circuit 322 can include both the rechargeable energy storage circuit 322' and the rechargeable energy storage circuit 322", or only one of the types can be set. The following two types of energy storage circuits are respectively provided in conjunction with the drawings. Explain in detail:

First, a rechargeable energy storage circuit 322' is provided as the energy storage circuit 322. As shown in FIG. 4, the rechargeable energy storage circuit 322' includes a charging circuit 3221 and an energy storage device 3222. The energy storage device 3222 is mainly used for saving. Energy, this function can be realized by a capacitor. When the energy storage device 3222 includes only one energy storage branch, it is called a single-branch energy storage device, and the single-branch energy storage device includes at least one capacitor. If the energy storage device 3222 includes a plurality of parallel energy storage branches, it is called a multi-branch energy storage device, and each of the energy storage branches in the multi-branch energy storage device includes at least one capacitor. Capacitors share energy. The charging circuit 3221 is configured to connect the power source to charge the energy storage device 3222. For the sake of convenience, in the present embodiment, the charging circuit 3221 is directly connected to the power supply circuit 31 to charge the energy storage device 3222, which simplifies the circuit.

Further, in order to make the energy storage circuit 322 more effective in the protection of the negative surge, the charging storage circuit 322' is further provided with a boosting device 3223, as shown in FIG. 5, the boosting device 3223 and the storage The energy device 3222 is connected in parallel to increase the voltage of the energy storage device 3222 so that the voltage of the energy storage device 3222 is higher than the normal working voltage of the power supply circuit 31, so that the energy stored in the energy storage device 3222 can offset the negative surge. It is also possible to maintain the voltage of the power supply circuit 31 as much as possible at a level that does not cause the power supply circuit to be powered down. On the other hand, the boosting device 3223 can also reduce the number of components in the energy storage device 3222: assuming that the charging circuit 3221 directly uses the power supply circuit 31 to charge the energy storage device 3222, it may be necessary to set a multi-channel energy storage. The device can meet the requirements, and the single-branch energy storage device alone is not enough to protect the negative surge in the power supply circuit 31, but if the boosting device 3223 is installed together with the single-branch energy storage device, it can satisfy It is required, and at this time, the voltage of the energy storage device 3222 can also be self-adjusted according to requirements.

FIG. 6 is a schematic diagram of the power supply circuit according to the embodiment. The MOS transistor in the slow start circuit is used as the object to be detected, and the detection circuit 321 detects the voltage at both ends. The energy storage circuit is a rechargeable energy storage circuit 322', the charging circuit is connected in the power supply circuit 31, and the power supply circuit 31 is used to charge the multi-branch energy storage device. The multi-branch energy storage device is composed of a plurality of capacitors connected in parallel. . An anti-reverse diode is disposed on the charging line to prevent energy entering the energy storage device from flowing back into the power supply circuit 31 through the charging line. When the power supply circuit 31 is working normally, the direction of the current flows from the drain of the MOS transistor in the slow start circuit to the source, that is, from A to B, and the level of point A is lower than point B. Level. At this time, the detection circuit 321 outputs a low level, but the low level does not serve as a valid control signal. When the detecting circuit 321 detects that the level of the point A is higher than the level of the point B, the detecting circuit 321 outputs a high level, and the control switch on the control circuit 323 is closed, so that the energy storage circuit is connected to the power supply circuit 31 for storage. The energy stored in the energy circuit can enter the power supply circuit 31 to protect against negative surges. The power supply circuit also includes a secondary protection circuit 33 coupled to the power supply circuit 3, the secondary protection circuit 33 being arranged to absorb negative surges in the power supply circuit.

Please refer to FIG. 7 for a schematic diagram of the power supply circuit. The energy storage circuit 322 includes a charging circuit, an energy storage device, and a boosting device. The difference from FIG. 6 is that the energy storage device is replaced by a multi-branch energy storage device. It became a single-branch energy storage device, and at the same time added a DC-DC circuit to convert low-voltage DC to high-voltage DC. At this time, the capacitor C2 functions as an energy storage device, and the magnitude of the voltage is determined by the DC-DC circuit.

Secondly, the charging storage circuit 322" is set as the energy storage circuit. The rechargeable energy storage circuit 322" can be the battery pack of the equipment room. Please refer to FIG. 8. The working principle of the power supply circuit shown in FIG. 8 is the same as that in FIG. The same, no longer repeat here. 8 and FIG. 6 differ only in the energy storage circuit. In FIG. 8, the equipment battery pack does not need to be connected to the power supply circuit 31 for charging.

It should be noted that, whether the charging storage circuit 322' or the rechargeable energy storage circuit 322" is provided as the energy storage circuit 322, the energy storage circuit should store energy for the time before the detection signal of the detection circuit 321 is issued, that is, The energy storage circuit 322 should store energy when the power supply circuit is working normally.

Embodiment 2:

The negative surge protection method provided in this embodiment detects whether an abnormal change occurs in the current direction of the detected object. When an abnormal change occurs in the current direction of the detected object, a negative surge occurs in the power supply circuit, and intervention is required. In order to ensure the normal operation of the power supply circuit. At this time, a control signal is issued, and pre-stored energy is released into the power supply circuit according to the control signal to offset the voltage drop of the power supply loop caused by the negative surge.

The negative surge protection method provided by this embodiment is further described below with reference to FIG. 9:

S901, detecting whether the current direction of the detected object in the power supply loop is abnormally changed Chemical

The detected object to be detected may be a linear component disposed in the power supply circuit. In this embodiment, the selected MOS transistor is selected as the object to be detected, mainly because a slow start is generally set in the power supply circuit. Circuitry, and MOS transistors are very common devices in slow-start circuits. Of course, it is also possible to select linear components in series with the slow start MOS transistor.

The purpose of the detection is to determine the direction of the current flowing through the object to be detected. Therefore, it should be possible for those skilled in the art to obtain without doubt. In the detection process, there are various operating parameters that can be detected, as long as the work is performed. The parameter can finally reflect the direction of the current flowing through the object to be detected. The direction of the current can be reflected by many parameters. In addition to the positive and negative values of the current, there are positive and negative voltage values at both ends of the detected object. Therefore, the detection operating parameter can be current or voltage.

S902, when the current direction changes abnormally, issuing a control signal;

The abnormal change here refers to the direction in which the operating current flowing through the detected object at a certain time is opposite to the direction of the current flowing through the detected object when the power supply circuit is operating normally.

S903. Release pre-stored energy into the power supply circuit according to the control signal.

In the case of normal operation of the power supply circuit, the pre-stored energy is equivalent to the no-load operation state. When the negative surge arrives, the control signal is sent to connect the path between the device for storing energy and the power supply circuit, so that the pre-stored Energy enters the power supply loop.

One way to pre-store energy is to set the charging energy storage circuit to store energy in advance, that is, to use the charging line to connect the charging power source and the energy storage device, and use the energy of the charging power source to charge the energy storage device; although the energy storage device The function of saving energy is mainly carried by capacitors, but when the energy storage device is installed, a single-branch energy storage device can be provided, or a multi-branch energy storage device can be provided, when the energy storage device includes only one energy storage branch. When the road is called a single-branch energy storage device, the single-branch energy storage device includes at least one capacitor. If the energy storage device provided includes a plurality of parallel energy storage branches, it is called a multi-branch energy storage device, and each of the energy storage branches in the multi-branch energy storage device includes at least one capacitor. These capacitors collectively store energy. The charging line is connected to the power source to charge the energy storage device. For the sake of convenience, the charging circuit in this embodiment can be directly connected to the power supply. Charging the energy storage device on the electrical circuit simplifies the circuit.

Further, the energy storage device can be boosted to make the energy storage circuit more effective in the protection of the negative surge. For example, a booster device is also provided in the rechargeable energy storage circuit, and the energy storage device is connected in parallel. Increasing the voltage of the energy storage device so that the voltage of the energy storage device is higher than the normal working voltage of the power supply circuit, so as to ensure that the energy stored in the energy storage device can counteract the negative surge while maintaining the voltage of the power supply circuit as much as possible. The level at which the power supply circuit is not powered down. On the other hand, the boosting device can also reduce the number of components in the energy storage device: assuming that the charging circuit directly uses the power supply circuit to charge the energy storage device, it may be necessary to provide a multi-branch energy storage device to meet the requirements. The single-branch energy storage device alone is not enough to protect the negative surge in the power supply circuit. However, if the booster device is installed together with the single-branch energy storage device, the requirements can be met, and the energy storage at this time can be satisfied. The voltage of the device can also be adjusted according to the needs.

Another way to pre-store energy is to not need to be charged, that is, to set up a non-rechargeable energy storage circuit to store energy in advance, for example, using a battery, such as the energy of a battery pack of a machine room, to protect against negative surges. The battery pack in the equipment room does not need to be connected to the power supply circuit for charging.

It is worth noting that whether the rechargeable energy storage circuit or the non-rechargeable energy storage circuit is pre-stored, the energy storage time should be before the control signal is sent.

In addition, in order to protect the negative surge more finely, a secondary protection circuit can be connected to the power supply circuit, and when a negative surge occurs in the power supply circuit, the negative surge in the power supply circuit is absorbed.

Embodiment 3

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for executing the method in the second embodiment.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Optionally, in this embodiment, the processor executes according to the stored program code in the storage medium. The steps of the method in the second embodiment are carried out.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

According to the power supply circuit provided by the embodiment of the present invention, the detection circuit detects whether the current direction of the detected object in the power supply loop changes abnormally. When the abnormal change of the current direction is detected, the control circuit connects the energy storage circuit and the power supply circuit. So that the energy storage circuit releases its pre-stored energy into the power supply circuit to avoid the voltage drop caused by the negative surge in the power supply circuit, thereby enabling the anti-reverse diode and the anti-reverse MOS tube to be provided without the anti-reverse diode and the anti-reverse MOS tube Protect against negative surge protection and normal power supply.

Claims

The power supply circuit according to claim 1, wherein said detected object is a linear element in said power supply circuit.
The power supply circuit of claim 1 further comprising a secondary protection circuit coupled to said power supply circuit, said secondary protection circuit being configured to absorb a negative surge in said power supply circuit.
The power supply circuit according to any one of claims 1 to 3, wherein the energy storage circuit comprises any one of the following two types:

a rechargeable energy storage circuit, the charging energy storage circuit includes a charging circuit and an energy storage device, and the charging circuit is connected to the charging power source and the energy storage device to charge the energy storage device;

A non-rechargeable energy storage circuit includes a battery pack.
The power supply circuit according to claim 3, wherein said energy storage device of said rechargeable energy storage circuit is any one of the following two types:

Single branch type, comprising an energy storage branch, wherein the energy storage branch includes at least one capacitor;

The multi-branch type includes a plurality of parallel energy storage branches, each of which includes at least one capacitor.
The power supply circuit according to claim 3, wherein the charging line is connected to the charging power source and the energy storage device is specifically: the charging line is connected to the power supply circuit, and the energy of the power supply circuit is obtained as the storage Can charge the device.
The power supply circuit according to claim 3, wherein said rechargeable energy storage circuit further comprises a boosting device, said boosting device and said energy storage device being connected in parallel, said voltage of said energy storage device being higher than The power supply loop voltage.
A negative surge protection method includes:

Detecting whether an abnormal change occurs in the direction of the current of the detected object in the power supply loop;

When the current direction changes abnormally, a control signal is issued;

The pre-stored energy is released into the power supply circuit in accordance with the control signal.
The negative surge protection method of claim 8, wherein the detected object is a linear element in the power supply loop.
The negative surge protection method according to claim 7 or 8, wherein the releasing the pre-stored energy into the power supply circuit according to the control signal further comprises: pre-storing energy; The method includes any one of the following two types:

Using a charging line to connect the charging power source and the energy storage device, and using the energy of the charging power source to charge the energy storage device;

The non-rechargeable energy storage circuit is pre-stored with energy, and the non-rechargeable energy storage circuit includes a battery pack.
The negative surge protection method according to claim 9, wherein the energy storage device is any one of the following two types:

Single branch type, comprising an energy storage branch, wherein the energy storage branch includes at least one capacitor;

The multi-branch type includes a plurality of energy storage branches connected in parallel, each of the energy storage branches including at least one capacitor.
The negative surge protection method according to claim 9, wherein when the charging power source and the energy storage device are connected by using a charging line, and the energy of the charging power source is used to charge the energy storage device, the charging power source is The power supply circuit.
The negative surge protection method according to claim 9, wherein when the charging power source and the energy storage device are connected by using the charging line, and the energy of the charging power source is used to charge the energy storage device, the method further comprises: The voltage of the energy storage device is such that the voltage of the energy storage device is higher than the voltage of the power supply circuit.
A storage medium, the storage medium comprising a stored program, wherein the device in which the storage medium is located is controlled to perform any one of claims 7 to 12 while the program is running The operation of the method described.
A processor for running a program, wherein the program is operative to perform the operations of the method of any one of claims 7 to 12.