WO2021103101A1

WO2021103101A1 - Power supply method for double-circuit power supply device

Info

Publication number: WO2021103101A1
Application number: PCT/CN2019/123429
Authority: WO
Inventors: 冉宏宇; 刘义刚; 魏明明; 李鸿强
Original assignee: 苏州贝昂科技有限公司
Priority date: 2019-11-29
Filing date: 2019-12-05
Publication date: 2021-06-03
Also published as: CN110829585A

Abstract

The present invention provides a power supply method for a double-circuit power supply device, and relates to the technical field of power supply circuits. The double-circuit power supply device comprises a battery power supply channel and an external power supply channel. The battery power supply channel comprises a battery power supply module and a first isolation diode which are connected in series, wherein the battery power supply channel and the external power supply channel are connected in parallel. The method comprises: connect one end of the external power supply channel to an external interface, and the other end to a load interface; connect an anode of the first isolation diode to the battery power supply module, and a cathode of the first isolation diode to the load interface; the battery power supply module supplies power to the load by means of the load interface when the first isolation diode is conducted. The power supply method for the double-circuit power supply device not only facilitates prolonging the service life of the battery, but also avoids the potential safety hazard caused by the damage of the battery to a certain extent.

Description

Power supply method of dual power supply device

Technical field

The invention relates to the technical field of power supply circuits, in particular to a power supply method for a dual-circuit power supply device.

Background technique

With the rapid development of electronic technology, there are more and more applications of lithium batteries. Generally, handheld devices such as mobile phones are used more and more frequently. However, the capacity of lithium batteries still has a large limit, which will cause frequent However, people often forget to unplug the charger after fully charged, and there is no protection for lithium battery charging and discharging, which often leads to various serious problems in the battery, which affects the service life of the battery. At the same time, there are certain Safety hazards.

In view of the above-mentioned technical problems that affect the service life of the battery due to the battery problem and the potential safety hazard, no effective solution has yet been proposed.

Summary of the invention

In view of this, the purpose of the present invention is to provide a power supply method for a dual-circuit power supply device to protect the battery from charging and discharging to avoid battery problems.

In a first aspect, an embodiment of the present invention provides a power supply method for a dual power supply device, wherein the dual power supply device includes: a battery power supply path and an external power supply path, the battery power supply path and the external power supply path are connected in parallel, The battery power supply path includes a battery power supply module and a first isolation diode connected in series; the power supply method includes:

Connect one end of the external power supply path to an external interface, and the other end to a load interface, and when the external interface has a power input, the load interface is used to supply power to the load;

Connecting the anode of the first isolation diode to the battery power supply module, and the cathode of the first isolation diode to the load interface to isolate the battery power supply module and the battery power supply path;

When the first isolation diode is turned on, the battery power supply module supplies power to the load through the load interface.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the external power supply path includes a second isolation diode, wherein the anode of the second isolation diode is connected to the external interface, and the cathode is connected to the external interface. Load interface connection.

With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the battery power supply module includes a battery and a boost unit connected in series, and the output terminal of the boost unit and the first isolation diode The anode is connected; the boost unit is used to boost the electrical signal output by the battery and deliver the boosted electrical signal to the load.

In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein a toggle switch is further provided on the series path between the battery and the boost unit, Used to control the output state of the battery.

In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein a self-recovery fuse is further provided at the output terminal of the above-mentioned battery.

In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the above-mentioned battery power supply module further includes a battery monitoring unit connected to the output terminal of the battery, Used to monitor the electrical signal output by the battery;

In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the battery monitoring unit includes a voltage dividing branch, and one end of the voltage dividing branch is connected to the battery The output terminal of the voltage divider is connected, and the other end of the voltage dividing branch is grounded; the voltage dividing branch includes a resistor connected in series, and a monitoring point is set on the series path of the resistor. The monitoring point is connected to an external device to transmit the electrical signal output by the battery To external equipment for monitoring.

In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the battery power supply module further includes a charging unit; the input terminal of the charging unit and the external interface Connect, the output terminal of the charging unit is connected to the battery; the charging unit is used to charge the battery when the external interface has a power input.

In combination with the sixth possible implementation manner of the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, wherein the battery power supply module further includes a charge and discharge protection unit connected to the battery for Protect the battery charging and discharging process.

With reference to the first aspect, an embodiment of the present invention provides a ninth possible implementation manner of the first aspect, wherein the above-mentioned dual power supply device further includes a filter circuit connected to an external interface, and is used for when the external interface has a power input, Filtering the input power; wherein the filter circuit includes an RC filter circuit and a capacitor filter circuit connected in parallel, and the capacitor filter circuit includes a plurality of filter branches for absorbing low-frequency interference signals and high-frequency interference signals.

The embodiments of the present invention bring the following beneficial effects:

The power supply method for a dual power supply device provided by an embodiment of the present invention can supply power to a load through a battery power supply path and an external power supply path connected in parallel, because the battery power supply path includes a battery power supply module and a first isolation diode connected in series, and The anode of the first isolation diode is connected to the battery power supply module, and the cathode of the first isolation diode is connected to the load interface, which can isolate the battery power supply module from the battery power supply path, and then only supply the load through the external power supply path when the external interface has power input. Power supply, and only supply power to the load through the battery power supply path when the external interface has no power input, to realize the protection of the battery in the battery power supply module, which not only helps to extend the service life of the battery, but also avoids it to a certain extent. A safety hazard due to damage to the battery.

Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or understood by implementing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures specifically pointed out in the description and the drawings.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

Description of the drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a dual-circuit power supply device provided by an embodiment of the present invention;

2 is a schematic structural diagram of another dual-circuit power supply device provided by an embodiment of the present invention;

3 is a schematic circuit diagram of a battery power supply path provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of another dual-circuit power supply device provided by an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them.的实施例。 Example. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

At present, most handheld electronic products are equipped with lithium batteries. However, the life of the battery in use will be greatly reduced due to various reasons, such as overcharging, overdischarging, overheating, etc., which will lead to a large battery capacity The reduction in amplitude, even battery bulging, smoke, leakage, explosion, etc., is mainly reflected in the following aspects:

(1) The battery is charged and discharged for a long time, which will easily cause the extreme reduction of the battery life.

(2) Batteries, smoke, liquid leakage, and even explosions caused by long-term charging often occur, which seriously threaten the safety of users' lives and properties.

(3) Long-term charging and discharging cause unnecessary operation loss of electronic components and affect the service life of the battery.

(4) Once the battery is damaged due to various reasons or the battery's protective device fails, etc., the live device cannot be used, resulting in a great waste of resources.

Based on this, the dual-circuit power supply device and power supply system provided by the embodiments of the present invention can effectively alleviate the above-mentioned technical problems.

In order to facilitate the understanding of this embodiment, a dual-circuit power supply device disclosed in the embodiment of the present invention is first introduced in detail.

Example one:

The embodiment of the present invention provides a dual-circuit power supply device. As shown in FIG. 1, the schematic structural diagram of the dual-circuit power supply device includes: a battery power supply path 10 and an external power supply path 20, wherein the battery power supply path and the external power supply path Parallel connection; one end of the external power supply path is connected to the external interface 30, and the other end is connected to the load interface 40, which is used to supply power to the load through the load interface when the external interface has power input;

Further, the battery power supply path 10 includes a battery power supply module 102 and a first isolation diode D1 connected in series, wherein the anode of the first isolation diode D1 is connected to the battery power supply module, and the cathode of the first isolation diode D1 is connected to the load interface for Isolate the battery-powered module and the battery-powered path.

In specific implementation, the battery power supply module is used to supply power to the load through the load interface when the first isolation diode is turned on.

In actual use, the above-mentioned external interface can be the interface of a power adapter, or a USB (Universal Serial Bus) interface, etc., which can be connected to a power adapter, and can also be connected to external devices such as mobile power supplies and computer hosts. Turn on the external power supply. As shown in Figure 1, because the access point of the external power supply path 20 is connected to the cathode of the first isolation diode D1, when the external interface has a power input, the voltage of the cathode of the first isolation diode D1 will increase, thereby causing The first isolation diode D1 is turned off, thereby isolating the battery power supply module 102 from the battery power supply path. When the external power supply connected to the external interface is disconnected, the cathode voltage of the first isolation diode D1 drops, so that after the first isolation diode D1 is turned on, the output terminal of the battery power supply module 102 is turned on with the load interface. The battery power supply module 102 continues to supply power to the load, so that when the external power supply is connected and removed, it has no influence on the power supply of the load.

An embodiment of the present invention provides a dual power supply device that can supply power to a load through a battery power supply path and an external power supply path connected in parallel, because the battery power supply path includes a battery power supply module and a first isolation diode connected in series, and the first isolation The anode of the diode is connected to the battery power supply module, and the cathode of the first isolation diode is connected to the load interface, which can isolate the battery power supply module from the battery power supply path, and then only supply power to the load through the external power supply path when the external interface has power input, and When there is no power input in the external interface, the load can be powered only through the battery power supply path to realize the protection of the battery in the battery power supply module. This not only helps to extend the service life of the battery, but also avoids the problem of the battery to a certain extent. Safety hazards arising from damage.

In specific implementation, in order to avoid the phenomenon of reverse current flow in the external power supply path during the power supply process of the battery power supply module, the above-mentioned external power supply path may further include a second isolation diode D2. Specifically, as shown in FIG. 2, a schematic structural diagram of another dual power supply device, wherein the anode of the second isolation diode D2 is connected to the external interface 30, and the cathode is connected to the load interface 40.

Further, as shown in FIG. 2, the battery power supply module 102 in the embodiment of the present invention includes a battery 103 and a boost unit 104 connected in series. The output terminal of the boost unit 104 is connected to the anode of the first isolation diode D1. The boosting unit 104 is used to boost the electrical signal output by the battery and deliver the boosted electrical signal to the load.

In specific implementation, the boost unit 104 includes a power chip, such as an AP2008 chip, which can boost the electrical signal output by the battery and supply power to the load. Specifically, FIG. 3 shows a schematic circuit diagram of a battery power supply path. As shown in FIG. 3, the chip U1 is a power supply chip, such as AP2008. The boost unit boosts the electrical signal output by the battery through the AP2008 chip. The load (for example, functional circuit) circuit connected later is powered. In addition to the power chip, the boost unit also includes a resistor R1 and a resistor R2. The connection method is shown in Figure 3. The resistor R1 and the resistor R2 are used to adjust the AP2008 chip. The output voltage, usually, the output voltage can be expressed as V=0.6V*(R1/R2), therefore, the output voltage can be selected by adjusting the resistance of the resistors R1 and R2.

In addition, considering that the load circuit or the functional circuit will not operate for a long time, in order to avoid over-discharge of the battery, a toggle switch can also be set on the series path of the battery and the booster unit to cut off the battery. The output path, in turn, controls the output state of the battery. Specifically, the toggle switch S1 shown in FIG. 3. Through the toggle switch S1, the user can manually disconnect the output of the battery when the battery is not used for a long time.

Further, the battery power supply path is also provided with a self-recovery fuse at the output end of the battery, such as self-recovery fuse F1 as shown in Fig. 3. Through this self-recovery fuse F1, the battery can be further protected at secondary level, and at the same time, it can also ensure In the case of damage to the front circuit, including the battery, it will not cause any damage to the load circuit (or functional circuit) connected to the back.

In actual use, in order to facilitate timely understanding of the storage state of the battery, the battery power supply module in the embodiment of the present invention further includes a battery monitoring unit connected to the output terminal of the battery for monitoring the electrical signal output by the battery.

Specifically, as shown in Figure 3, the battery monitoring unit includes a voltage dividing branch, namely a branch composed of a resistor R3 and a resistor R4. One end of the voltage dividing branch is connected to the output terminal of the battery, and the other of the voltage dividing branch is connected to the output terminal of the battery. One end is grounded; the voltage dividing branch includes resistors connected in series, namely resistor R3 and resistor R4. A monitoring point is set on the series path of resistors, namely the monitoring point J1 between resistor R3 and resistor R4, and the monitoring point is connected to external equipment. Connection, used to transmit the electrical signal output by the battery to external equipment for monitoring. Specifically, the resistor R3 and the resistor R4 can also be called sampling resistors, which are divided by the resistor R3 and the resistor R4 and connected to the AD detection port of the MCU (Microcontroller Unit) of the external device, where the external device The MCU is not shown in Figure 3, which can monitor the voltage of the battery in real time to ensure the safety of the battery and the stable operation of the entire dual-circuit power supply device.

Considering that the battery can usually be charged to ensure its continuous power supply capability, the battery can be charged when the external interface has power input to extend the power supply time of the battery. Therefore, in the dual power supply provided by the present invention In the device, a charging unit for supplying power to the battery can also be provided to facilitate charging the battery when the external interface has a power input.

Based on this, on the basis of Figure 3, Figure 4 also shows a schematic circuit diagram of another dual power supply device, in addition to the circuit part shown in Figure 3, also includes a charging unit; the charging unit usually includes a charging management chip To manage the charging process of the battery, as shown in Figure 3, the chip U2 is a charging management chip. Specifically, the chip U2 can be a charging management IC of the IC-CE3320 model, and the IC-CE3320 is 2A Switching step-down synchronous rectification charge management chip, the chip integrates a charging current sensing resistor; and the accuracy of charging current and charging voltage is high, at the same time, it also has functions such as bad battery discrimination and dynamic adjustment of input voltage. Specifically, as shown in Fig. 4, the input end of the charging unit (chip U2) is connected to the external interface, and the output end of the charging unit is connected to the battery for charging the battery when the external interface has a power input.

In specific implementation, the peripheral circuit of the charge management IC is shown in Figure 4, including a resistor R5 and a capacitor C1. The resistor R5 is equivalent to the control resistor of the charge management chip IC-CE3320. IC-CE3320 can adjust the maximum value through this control resistor. For the charging current, the relationship between the charging current and the resistance R5 is I=560/R5. Therefore, R5=280Ω can be selected, and the maximum charging current I=2A at this time. The capacitor C1 is used to ensure the stability of the output current of the charging management chip IC-CE3320 during the charging process. Further, in order to facilitate the monitoring of the charging status of the battery, the charging management chip usually also has a working status indicator output pin, as shown in Figure 4, pin J2, through which it can communicate with an external terminal. Through the collection IC-CE3320 The amount of output signal to determine the state of charge of the battery.

Further, in order to avoid overcharging or overdischarging of the battery, the battery power supply module described above further includes a charge and discharge protection unit connected to the battery to protect the battery during the charge and discharge process. Specifically, the battery may be a lithium battery. The charge-discharge protection unit 400 shown in FIG. 4 may be implemented by a battery protection chip. For example, the battery protection chip DW01 can be used in conjunction with a MOS switch tube with a model of 8205A to realize the protection of the battery. Overcharge protection, over discharge protection, output short circuit protection and other functions.

In addition, the dual power supply device shown in Figure 4 also includes a filter circuit connected to the external interface for filtering the input power when the external interface has a power input; wherein, the filter circuit includes a RC connected in parallel. The filter circuit and the capacitor filter circuit. The capacitor filter circuit includes a plurality of filter branches for absorbing low-frequency interference signals and high-frequency interference signals.

Specifically, as shown in Figure 4, the RC filter circuit includes a resistor R6 and a capacitor C2, which can absorb the high voltage generated at the moment of hot plugging and unplugging of the external interface, and at the same time, to change the voltage from 0V to the working voltage (for example, 5V). There will be no voltage jitter. Capacitor C3 and Capacitor C4 are the two filter branches of the capacitor filter circuit. In actual use, you can choose a suitable capacitor value to make capacitor C3 absorb low-frequency interference; and capacitor C4 to absorb high-frequency interference. The specific capacitance value can be based on actual use. The usage situation is set, which is not limited in the embodiment of the present invention.

Furthermore, in FIG. 4, the L1 disposed near the external interface is a magnetic bead, and the magnetic bead L1 can smooth the input current and further reduce the jitter of the electrical signal.

Further, both the first isolation diode D1 and the second isolation diode D2 shown in FIG. 4 can be Schottky diodes, where the first isolation diode D1 can prevent the power input of the external interface from flowing back into the boost unit to cause boost The unit is unstable, and the second isolation diode D2 can also prevent the current generated by the power supply of the external interface from flowing backward.

It should be understood that, in the schematic circuit diagram shown in FIG. 4, the types and parameters of the electronic components used can also be set according to actual use conditions, which are not limited in the embodiment of the present invention.

Based on the schematic circuit diagram of the dual power supply device shown in FIG. 4, the circuit working process of the dual power supply device provided by the embodiment of the present invention is as follows, where the above-mentioned external interface is a USB interface, and the above-mentioned battery is a lithium battery as an example for description:

(1) After the USB interface voltage (5V～6V) is input, one of them is filtered by the magnetic bead L2, and then the filter circuit composed of the resistor R6 in series with the capacitor C2 is filtered to remove the interference caused by the hot plug and hot plug, the capacitor C3 and the capacitor C4 removes high frequency and low frequency interference.

(2) Then it is connected to the charging unit formed by the charging management chip U2. The charging unit is controlled by the resistor R5 to input the current of the lithium battery, and the capacitor C1 plays the role of stabilizing the charging current, and then the charging and discharging protection unit is connected to charge the lithium battery.

(3) After the lithium battery passes through the charge and discharge protection unit, the battery and the device circuit are further protected by the self-recovery fuse F1, and then the switch is closed and connected to the boost unit U1. The resistor R1 and the resistor R2 are used to control the output voltage, output voltage It is usually controlled to 4.8V, and then the output voltage is 4.5V after passing through the Schottky diode D1 (the first isolation diode).

(4) This 4.5V voltage and USB input voltage pass through Schottky diode D2 (the second isolation diode) and output a voltage above 4.7V before the load interface 40. Due to the voltage difference, when there is USB input, Schottky The diode D1 is cut off, and only the power connected to the USB is used to supply power to the load. Due to the Schottky diode D1, it effectively prevents the current from flowing back to the boost unit, causing the circuit to become unstable. At the same time, when the USB is unplugged, due to Schottky The base diode D1 will also be turned on instantaneously, so that the power supply to the load is switched to the power supply path where the lithium battery is located. In this way, when the USB external power supply is used, only the external power source is used to reduce the loss of the lithium battery. At the same time, the dedicated charging is used. The module (the charging unit formed by the charging management chip U2) and the lithium battery protection circuit (the charging and discharging protection unit 400), so that when the lithium battery is fully charged after the USB external power supply is connected, the charging voltage of the lithium battery can be disconnected to avoid Connect to the power source for a long time. In this way, there is no need to worry about the safety of the lithium battery caused by the long-term insertion of the lithium battery into the charger, and at the same time, there is no problem with switching between the two circuits.

In summary, the dual-circuit power supply device provided by the embodiment of the present invention has the following beneficial effects:

(1) In the hardware design, a battery charge and discharge protection unit is added to provide a larger and safer power supply current; at the same time, a self-recovery fuse, multiple protection devices and personal safety are added.

(2) Through an isolation diode, the battery is separated from the external power supply circuit by using the unidirectional conductivity of the voltage. Without considering the battery's own discharge, it can fundamentally solve the problems caused by the battery in the long-term charging state. Greatly improve the safety and reliability of the battery.

(3) The battery does not supply external power when the battery is charged. When the battery is fully charged, it is not charged, and at the same time, it does not supply external power. Even if there is no battery or the battery is damaged, it still operates normally.

Embodiment two:

Based on the dual power supply device provided in the foregoing embodiment, an embodiment of the present invention also provides a power supply system. Specifically, the power supply system is configured with the dual power supply device described in the first embodiment.

The power supply system provided by the embodiment of the present invention has the same technical features as the dual-circuit power supply device provided in the foregoing embodiment, so it can also solve the same technical problems and achieve the same technical effects.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the power supply system described above can refer to the corresponding process in the foregoing embodiment, which will not be repeated here.

In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they may be fixed connections or detachable connections. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above-mentioned terms in the present invention can be understood under specific circumstances.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

Finally, it should be noted that the above embodiments are only specific implementations of the present invention, to illustrate the technical solutions of the present invention, rather than limiting them. The protection scope of the present invention is not limited thereto, although referring to the foregoing embodiments The present invention has been described in detail, and those skilled in the art should understand that any person skilled in the art within the technical scope disclosed in the present invention can still modify the technical solutions described in the foregoing embodiments or can easily imagine Changes, or equivalent replacements of some of the technical features; and these modifications, changes, or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered by the protection scope of the present invention Inside. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A power supply method for a dual power supply device, wherein the dual power supply device includes a battery power supply path and an external power supply path, wherein the battery power supply path and the external power supply path are connected in parallel, and the battery power supply path It includes a battery power supply module and a first isolation diode connected in series; the power supply method includes:

Connect one end of the external power supply path to an external interface, and the other end to a load interface, and when the external interface has a power input, the load interface is used to supply power to the load;

Connecting the anode of the first isolation diode to the battery power supply module, and the cathode of the first isolation diode to the load interface to isolate the battery power supply module and the battery power supply path;

When the first isolation diode is turned on, the battery power supply module supplies power to the load through the load interface.
The power supply method according to claim 1, wherein the external power supply path comprises a second isolation diode, wherein the anode of the second isolation diode is connected to the external interface, and the cathode is connected to the load interface.
The power supply method according to claim 1, wherein the battery power supply module comprises a battery and a boost unit connected in series, and an output terminal of the boost unit is connected to the anode of the first isolation diode;

The boosting unit is used to boost the electric signal output by the battery, and deliver the boosted electric signal to the load.
The power supply method according to claim 3, wherein a toggle switch is further provided on the series path of the battery and the boost unit for controlling the output state of the battery.
The power supply method according to claim 3, wherein the output terminal of the storage battery is further provided with a self-recovery fuse.
The power supply method according to claim 3, wherein the battery power supply module further comprises a battery monitoring unit connected to the output terminal of the battery, for monitoring the electrical signal output by the battery.
The power supply method according to claim 6, wherein the battery monitoring unit comprises a voltage dividing branch, one end of the voltage dividing branch is connected to the output terminal of the battery, and the other of the voltage dividing branch is connected to the output terminal of the battery. One end is grounded;

The voltage dividing branch includes a resistor connected in series, and a monitoring point is provided on the series path of the resistor, and the monitoring point is connected to an external device for transmitting the electrical signal output by the battery to the external device. monitor.
The power supply method according to claim 3, wherein the battery power supply module further comprises a charging unit;

The input end of the charging unit is connected to the external interface, and the output end of the charging unit is connected to the storage battery;

The charging unit is used for charging the storage battery when the external interface has a power input.
The power supply method according to claim 7, wherein the battery power supply module further comprises a charge and discharge protection unit connected to the battery, and is used to protect the charge and discharge process of the battery.
The power supply method according to claim 1, wherein the dual power supply device further comprises a filter circuit connected to the external interface, and is configured to respond to the input power supply when the external interface has a power supply input. Perform filtering processing;

Wherein, the filter circuit includes an RC filter circuit and a capacitor filter circuit connected in parallel, and the capacitor filter circuit includes a plurality of filter branches for absorbing low-frequency interference signals and high-frequency interference signals.