TWI596863B - Electronic apparatus with backup power supply and charging and discharging method of backup power supply - Google Patents

Description

Electronic device with backup power supply and charging and discharging method of standby power supply

The present invention relates to a charging and discharging method for an electronic device having a backup power source and a backup power source, and more particularly to an electronic device that can operate with a standby power source when the external power source stops supplying power.

Electronic devices require a source of electrical power for operation, but current common designs do not ensure that electronic devices can still be rehabilitated when power is lost. Taking the driving recorder as an example, the driving recorder is used to record the driving status video as evidence of the accident. Driving recorders typically provide a source of electricity by means of a vehicle. When a traffic accident or other situation occurs, causing the power source provided by the vehicle to the driving recorder to suddenly be lost, if the driving recorder has no backup power or the backup power source is insufficiently stored, it may not be able to smoothly close the file. The image file was damaged, even if it was not stored in the image file at the time of the accident.

Therefore, an electronic device such as a driving recorder can maintain part of the function operation when the power source is lost, or how to prevent the driving recorder from being able to save the correct file due to power problems, and become a manufacturer when designing the driving recorder. A practical problem that needs to be solved. In other words, how to make the electronic product successfully complete the shutdown process without losing the warning power, is a problem that manufacturers can not ignore when designing the product. Although the parties to the multi-case have installed the driving recorder, they are unable to come in handy at the crucial moment.

The present invention provides a charging and discharging method for an electronic device having a backup power source and a backup power source, thereby solving the problem that the electronic product existing in the prior art cannot be operated due to insufficient power storage.

The electronic device with the backup power source disclosed in the invention is electrically connected to the external power source, and has a power module, a main power module and a backup power module. The main power module is electrically connected to an external power source to supply power to the power module. The backup power supply has a first power storage unit, a second power storage unit, a first bypass unit, and a second bypass unit. The first power storage unit is electrically connected to the main power module. When the external power source is normally powered, the independent power module receives the power supply of the external power source, and provides the stored power to the power module when the external power source stops supplying power. The first bypass unit is connected in parallel to the first power storage unit to provide a first bypass path to limit the voltage value provided by the main power module to the first power storage unit. The first bypass unit has a first control end, and the first control end is electrically connected to the external power source to selectively turn on the first bypass path according to whether the external power source is normally powered.

The charging and discharging method of the standby power source disclosed in the present invention is applicable to an electronic device having a backup power source, the electronic device is electrically connected to the external power source, and has a power module and a backup power module, and the charging and discharging method of the backup power source is included in When the external power supply is normally powered, the external power supply is supplied to the power module and the standby power module. When the backup power module is charged by the power supply of the external power source, the bypass path of the standby power module is turned on to limit the voltage value provided for charging the standby power module. When the external power supply stops supplying power, the bypass path is not turned on, and the backup power module provides the stored power to the power module.

According to the charging and discharging method of the electronic device with standby power supply and the backup power source disclosed in the above, the first bypass unit limits the main power supply module to the first power storage unit and the second when the external power supply is normally powered. The voltage value of the power storage unit is such that the amount of power stored by the first power storage unit and the second power storage unit can be controlled without being affected by the equivalent resistance of the first power storage unit itself. When the external power supply stops supplying power and switches the power stored by the first power storage unit to the power module, the first bypass unit is not connected to the first power storage unit, so that the power stored by the first power storage unit does not pass through The first bypass unit leaks, and thus the stored power can be more completely provided to the power module.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Referring to FIG. 1 , FIG. 1 is a functional block diagram of an electronic device according to an embodiment of the invention. As shown in FIG. 1 , the electronic device 10 has a main power module 11 , a power module 13 , and a backup power module 15 . The main power module 11 is, for example, a power transmission interface, a power converter or other suitable components. The main power module 11 is electrically connected to the external power source 20 to convert the electrical energy supplied by the external power source 20 into the power module 13 . The specifications are provided to the power module 13 and a portion of the power is supplied to the backup power module 15 to charge the backup power module 15.

The backup power module 15 has a first power storage unit 151, a second power storage unit 152, a first bypass unit 153, and a second bypass unit 154. The first power storage unit 151 and the main power module 11 are connected to the first node N1. The second power storage unit 152 and the first power storage unit 152 are connected to the second node N2. When the external power source 20 is normally powered, the first power storage unit 151 and the second power storage unit 152 receive the power of the external power source 20 and charge the power of the external power source 20. When the external power source 20 stops supplying power, the first power storage unit 151 and the second power storage unit 152 provide the stored power to the power module 13 . The power module 13 refers to other power components in the electronic device 10. For the driving recorder, the power module 13 is, for example, a processing system of a driving recorder or other suitable electrical components.

The first bypass unit 153 is connected in parallel to the first power storage unit 151 and provides a first bypass path to limit the voltage value provided by the main power module 11 to the first power storage unit 151. The first bypass unit 153 has a first control terminal 153a. The first control terminal 153a is electrically connected to the external power source 20 to selectively turn on the first bypass path according to whether the external power source 20 is normally powered, that is, the first node is turned on. N1 and the second node N2. The second bypass unit 154 is connected in parallel to the second power storage unit 152 and provides a second bypass path to limit the voltage value provided by the main power module 11 to the second power storage unit 152. The second bypass unit 154 has a second control terminal 154a. The second control terminal 154a is electrically connected to the external power source 20 to selectively turn on the second bypass path according to whether the external power source 20 is normally powered, that is, the second node is turned on. N2 and reference potential terminal.

In other words, when the external power supply is normally powered, the first bypass unit 153 is electrically connected to the first node N1 and the second node N2, and the second bypass unit 154 is electrically connected to the second node N2 and the reference potential terminal to limit the main power supply. The module 11 supplies the voltage value of the first power storage unit 151 and the voltage value of the second power storage unit 152. In practice, when the external power source 20 is normally powered, the first bypass unit 153 and the second bypass unit 154 may be used to evenly distribute the power provided by the external power source 20 to the first power storage unit 151 and the second power storage unit 152. The first power storage unit 151 and the second power storage unit 152 are charged at the same voltage value without being affected by the equivalent resistance of the first power storage unit 151 and the second power storage unit 152 itself.

When the external power source 20 stops supplying power, and the first power storage unit 151 and the second power storage unit 152 supply power to the power module 13, the first bypass unit 153 is not electrically connected to the first node N1 and the second node. N2, and the second bypass unit 154 is not electrically connected to the second node N2. The power stored by the first power storage unit 151 and the second power storage unit 152 is supplied to the power module 13 without leakage from the first bypass unit 153 and the second bypass unit 154, thereby reducing the first The unnecessary electric power loss of the electric storage unit 151 and the second electric storage unit 152, and the case where the first electric storage unit 151 and the second electric storage unit 152 leak to the ground.

In other words, when the external power source 20 is normally powered, the power module 13 of the electronic device 10 operates according to the power supply of the external power source 20, and when the external power source 20 fails to supply power or even loses power, the electronic device 10 can be powered by the backup power module 15. For a period of time, the electronic device 10 is allowed to complete the necessary shutdown procedures. In the example of the driving recorder, the external power source 20 is, for example, a power source provided by the vehicle. When the vehicle is normally powered, the driving recorder operates with the power supply of the vehicle. When the vehicle stops supplying power, the driving recorder can be powered by the backup power source. The module is powered for a period of time to complete the shutdown process. The shutdown procedure of the driving recorder is, for example, continuously recording for 3 seconds, and the last recorded image file is closed and stored.

2, FIG. 2 is a functional block diagram of an electronic device according to another embodiment of the present invention. As shown in FIG. 2, the electronic device 30 has a main power module 31 and a power module 33. The backup power module 35 and the voltage dividing module 37. The main power module 31 is electrically connected to the external power source 40 to supply power to the power module 33 and charge the backup power module 35. The backup power module 35 has a first power storage unit 351, a second power storage unit 352, a first bypass unit 353, and a second bypass unit 354.

The first bypass unit 253 includes a first bypass resistor R1 and a first bypass switch M1. The first bypass resistor R1 and the first bypass switch M1 are electrically connected to the first node N1 and the second node N2. between. The second bypass unit 254 includes a second bypass resistor R5 and a second bypass switch M3 connected in series, and the second bypass resistor R5 and the second bypass switch M3 are electrically connected between the second node N2 and the reference potential terminal. . The first bypass switch M1 and the second bypass switch M2 are selectively turned on according to whether the external power source 40 is normally powered. When the external power supply 40 is normally powered, the first bypass switch M1 and the second bypass switch M2 are turned on, and the first bypass resistor R1 is electrically connected between the first node N1 and the second node N2, and the second bypass resistor R5 is electrically connected between the second node N2 and the reference potential terminal. When the external power supply 40 stops supplying power, the first bypass switch M1 and the second bypass switch M2 are not turned on, and the first bypass resistor R1 is not electrically connected between the first node N1 and the second node N2, the second side The path resistance R5 is also not electrically connected between the second node N2 and the reference potential terminal.

The first bypass switch M1 has a first end, a second end, and a control end. The first end of the first bypass switch M1 is electrically connected to the first node N1, the second end of the first bypass switch M1 is electrically connected to the second node N2, and the control end of the first bypass switch M1 is electrically connected to the voltage divider. The voltage dividing node Nd of the module 37. The second bypass switch M2 has a first end, a second end, and a control end. The first end of the second bypass switch M2 is electrically connected to the second node N2. The second end of the second bypass switch M2 is electrically connected to the reference end, and the control end of the second bypass switch M2 is electrically connected to the voltage dividing node Nd of the voltage dividing module 37.

The voltage dividing module 37 has a resistor R3 and a resistor R4. One end of the resistor R3 is electrically connected to the external power source 40, and the other end of the resistor R3 is electrically connected to the voltage dividing node Nd. One end of the resistor R4 is electrically connected to the voltage dividing node Nd, and the other end of the resistor R4 is electrically connected to the reference voltage terminal. The voltage dividing module 37 is configured to divide the power provided by the external power source 40, so that the first bypass switch M1 and the second bypass switch M2 are selectively turned on according to the voltage of the voltage dividing node Nd.

In practice, when the external power source 40 is normally powered, the voltage difference across the first shunt resistor R1 is related to the voltage value provided by the main power module 31 to the first power storage unit 351, and the voltage across the second shunt resistor R2. The difference is associated with the voltage value provided by the main power module 31 to the second power storage unit 352. More specifically, the voltage value supplied from the main power module 31 to the first power storage unit 351 is substantially equal to the voltage difference between the first shunt resistor R1 and the voltages of the first end and the second end of the first bypass switch M1. The sum of the differences. The voltage value supplied from the main power module 31 to the second power storage unit 351 is substantially equal to the voltage difference between the second bypass resistor R2 and the voltage difference between the first end and the second end of the second bypass switch M2.

In one embodiment, when the external power source 40 is normally powered, the first bypass switch M1 is turned on and the second bypass switch M2 is turned on, and the first shunt resistor R1 is connected in parallel to the first power storage unit 351, the second side. The path resistance R2 is connected in parallel to the second power storage unit 352. By adjusting the resistance ratio of the first shunt resistor R1 and the second shunt resistor R2, the voltage value supplied by the main power module 31 to the first power storage unit 351 and the second power storage unit 352 is desired. The partial pressure ratio. In practice, the resistance ratio of the first shunt resistor R1 and the second shunt resistor R2 is, for example, such that the first power storage unit 351 and the second power storage unit 352 have the same stored power. In another embodiment, the resistance ratio of the first shunt resistor R1 to the second shunt resistor R2 may cause the first power storage unit 351 and the second power storage unit 352 to be charged at the same voltage value. Those skilled in the art can freely design according to actual needs, and the embodiment is not limited.

When the external power source 40 stops supplying power, the first bypass switch M1 is not turned on and the second bypass switch M2 is not turned on, the first shunt resistor R1 is not connected in parallel to the first power storage unit 351, and the second shunt resistor R2 is not connected in parallel. The second power storage unit 352. The first power storage unit 351 and the second power storage unit 352 can supply power only to the power module 23 without being erroneously discharged from the first bypass resistor R1 and the second bypass resistor R2.

In the embodiment, the electronic device 30 further has a first backflow prevention component DZ1, a second backflow prevention component DZ2, a third backflow prevention component DZ3, and a current limiting resistor R5. The first backflow prevention component DZ1 is electrically connected between the first node N1 and the power module 33. The second anti-backflow device DZ2 and the current limiting resistor R5 are connected in series between the first node N1 and the main power module 31, and the third anti-backflow device DZ3 is electrically connected between the main power module 31 and the power module 33. In practice, when the first power storage unit 351 and the second power storage unit 352 are not fully charged, the power supply of the external power source 40 is first through the main power supply 31, the second backflow prevention component DZ2, and the current limiting resistor R5. The power storage unit 351 and the second power storage unit 352 are charged. On the other hand, the power supply of the external power source 40 is also supplied to the power module 33 through the third backflow prevention element DZ3. When the first power storage unit 351 and the second power storage unit 352 are fully charged, the first power supply module 31 passes through the first stage because the first anti-backflow component DZ1 is disposed between the first node N1 and the power module 33. The equivalent resistance of the path from the node N1 to the power module 33 is large. Therefore, the voltage output by the main power module 31 temporarily suspends charging of the first power storage unit 351 and the second power storage unit 352, thereby optimizing the service life of the first power storage unit 351 and the second power storage unit 352. . In practice, the first backflow prevention element DZ2 and the second backflow prevention element DZ3 may be sub-circuits connected by a plurality of electronic components, which is not limited in this embodiment.

In one embodiment, the power module 33 includes a processing unit 331. Processing unit 331 is, for example, a central processing unit, microprocessor or other suitable component of electronic device 30. The processing unit 331 is electrically connected to the first node N1 to receive a signal on the first node N1, for example, a voltage VN1. When the electronic device receives the power supply from the external power source 40, the processing unit 331 determines the charging curve of the first power storage unit 351 and the second power storage unit 352 according to the voltage VN1 of the first node N1, and determines the first storage according to the charging curve. The capacitance of the electric unit 351 and the second electric storage unit 352.

In more detail, the first power storage unit 351 and the second power storage unit 352 have corresponding time constants that affect their charging time and charging rate, whether viewed separately or in a unified manner. The relative relationship between the output voltage or the charging current of the first power storage unit 351 and the second power storage unit 352 and time forms the charging curve. In other words, the time constant of the first power storage unit 351 and the second power storage unit 352 can be derived from the linear change of the charging curve, and the first power storage unit 351 and the second power storage unit 352 are further derived. The capacitance value is used to determine the degree of loss of the first power storage unit 351 and the second power storage unit 352. In an embodiment, when the processing unit 331 determines that the capacitance of the first power storage unit 351 and the second power storage unit 352 is lower than a preset threshold, the processing unit 331 may generate an alert signal to notify the user to replace the first The respective components of the power storage unit 351 and the second power storage unit 352.

In one embodiment, when the external power source 40 fails to supply power or powers down and forces the electronic device 30 to perform a shutdown process, the power module 33 can complete the necessary shutdown procedure by supplying power from the backup power module 35, for example, Shut down after an extended period of time. When the processing unit 331 determines that the capacitance of the first power storage unit 351 and the second power storage unit 352 is lower than the preset threshold, the warning signal generated by the processing unit 331 may also notify the power module 33 to correct the shutdown procedure, for example, Reduce the length of time in the shutdown process.

Taking the driving recorder as an example, when the capacity of the first power storage unit 351 and the second power storage unit 352 is not lower than the preset threshold, the vehicle stops supplying power to the driving recorder, and the driving recorder can be used by The power supply of the backup power module 35 continues to record for 3 seconds, and the last recorded image file is closed and stored. When the capacitance of the first power storage unit 351 and the second power storage unit 352 is lower than a preset threshold, the driving recorder can reduce the duration of continuous recording, or cancel the continuous recording, and directly close the last recorded image file. File and storage.

On the other hand, the processing unit 331 determines the charging curves of the first power storage unit 351 and the second power storage unit 352 according to the voltage VN1 of the first node N1, and the first power storage unit 351 and the second power storage device are provided in the electronic device 30. When the unit 352 is shipped from the factory, the power storage capacity of the first power storage unit 351 and the second power storage unit 352 can be simply detected during the startup or shutdown of the electronic device 30, thereby ensuring the first power storage unit 351 and the second storage. The power storage capability of the electrical unit 352 can also ensure the shipment quality of the electronic device 30.

In the foregoing embodiments, for convenience of description, the embodiment having the first power storage unit, the second power storage unit, the first bypass unit, and the second bypass unit is directly described. In practice, in the related art According to the above, the general knowledge of the field may reduce the setting of the second power storage unit and the second bypass unit, or increase the setting of more power storage units and bypass units, which is not limited in this embodiment.

For a more detailed description of the charging and discharging method of the backup power supply, please refer to FIG. 1 and FIG. 3 together. FIG. 3 is a flow chart showing the steps of the charging and discharging method of the standby power supply according to an embodiment of the invention. As shown in the figure, in step S501, the electronic device 10 supplies power from the external power source 20 to the power module 13 and the backup power module 15. In step S502, when the backup power module 15 is charged by the power supply of the external power source 20, the bypass path of the backup power module 15 is turned on to limit the voltage value supplied to the backup power module 15. In step S503, it is determined whether the external power source 20 is normally powered. When the external power source 20 is normally powered, it proceeds to step S501. When the external power source 20 stops supplying power, in step S504, the bypass path is not turned on, and the backup power module 15 supplies the stored power to the power module 13.

In another embodiment, please refer to FIG. 1 and FIG. 4 together. FIG. 4 is a flow chart showing the steps of the charging and discharging method of the standby power supply according to another embodiment of the present invention. As shown in the figure, in step S601, the electronic device 10 supplies the power of the external power source 20 to the power module 13 and the backup power module 15. In step S602, the electronic device 10 determines the capacitance of at least one of the first power storage unit 151 and the second power storage unit 152 according to the charging curve of at least one of the first power storage unit 151 and the second power storage unit 152. In step S604, it is determined whether the capacitance of at least one of the first power storage unit 151 and the second power storage unit 152 is lower than a threshold value, and at least one of the first power storage unit 151 and the second power storage unit 152 is electrically When the capacity is lower than the threshold, in step S606, the electronic device 10 generates an alert signal or reduces the length of time.

In step S603, when the backup power module 15 is charged by the power supply of the external power source 20, the bypass path of the backup power module 15 is turned on, that is, the first bypass unit 153 and the second bypass unit 154 provide the first The bypass path and the second bypass path limit the voltage value that is supplied to the backup power module 15 for charging. In step S605, it is determined whether the external power source 20 is normally powered. When the external power source 20 is normally powered, the process goes to step S601. When the external power source 20 stops supplying power, in step S607, the bypass path is not turned on, and the backup power module 15 supplies the stored power to the power module 13. The charging and discharging method of the standby power source according to the present invention has been substantially disclosed in the above-described embodiments, and the description of the embodiment will not be repeated here.

In summary, the present invention provides a charging and discharging method for an electronic device having a backup power source and a backup power source, wherein the first bypass unit and the second bypass unit are respectively connected in parallel to the first power storage unit and the second power storage unit. . When the external power source is normally powered, the first bypass unit and the second bypass unit may limit the voltage values provided by the main power module to the first power storage unit and the second power storage unit, so that the main first power storage unit and the first The amount of electricity stored by the second power storage unit can be controlled without being affected by the equivalent resistance of the first power storage unit and the second power storage unit itself. When the external power supply stops supplying power, and the first power storage unit and the second power storage unit are switched to supply power to the power module, the first bypass unit and the second bypass unit are not electrically connected to the first power storage unit and The second power storage unit is configured such that power stored by the first power storage unit and the second power storage unit does not leak through the first bypass unit and the second bypass unit, so that the first power storage unit and the second power storage unit store Power can be provided to the electronic device to complete the necessary shutdown procedures. In addition, in one embodiment, the capacitances of the first power storage unit and the second power storage unit are determined by detecting the charging curves of the first power storage unit and the second power storage unit, and may also be in the first storage. When the electric capacity of the electric unit and the second electric storage unit is insufficient to allow the electronic device to complete the necessary shutdown procedure, the electronic device is reminded to correct the shutdown procedure to avoid the loss caused by the improper shutdown of the electronic device.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

10, 30‧‧‧ Electronic devices

11, 31‧‧‧ main power module

13, 33‧‧‧Power Module

15, 35‧‧‧Reserved power module

151, 351‧‧‧ first power storage unit

152, 352‧‧‧Second electricity storage unit

153, 353‧‧‧ first bypass unit

153a‧‧‧First control terminal

154a‧‧‧second control end

154, 354‧‧‧second bypass unit

331‧‧‧Processing unit

20, 40‧‧‧ External power supply

DZ1‧‧‧First anti-backflow unit

DZ2‧‧‧second anti-backflow unit

DZ3‧‧‧ third anti-backflow unit

M1‧‧‧First Bypass Switch

M2‧‧‧Second bypass switch

N1‧‧‧ first node

N2‧‧‧ second node

R1‧‧‧First shunt resistor

R2‧‧‧second shunt resistor

R3, R4‧‧‧ resistance

R5‧‧‧ current limiting resistor

VN1‧‧‧ voltage

FIG. 1 is a functional block diagram of an electronic device according to an embodiment of the invention. 2 is a functional block diagram of an electronic device according to another embodiment of the present invention. FIG. 3 is a flow chart showing the steps of a method for charging and discharging a backup power supply according to an embodiment of the invention. FIG. 4 is a flow chart showing the steps of a method for charging and discharging a backup power supply according to another embodiment of the present invention.

10‧‧‧Electronic devices

11‧‧‧Main power module

13‧‧‧Power Module

15‧‧‧Replacement power module

151‧‧‧The first electricity storage unit

152‧‧‧Second electricity storage unit

153‧‧‧First bypass unit

153a‧‧‧First control terminal

154‧‧‧Second bypass unit

154a‧‧‧second control end

20‧‧‧External power supply

N1‧‧‧ first node

N2‧‧‧ second node

Claims (15)

An electronic device having a backup power source electrically connected to an external power source, the electronic device comprising: a power module; a main power module electrically connected to the external power source to supply power to the power module; And a standby power module, comprising: a first power storage unit electrically connected to the main power module, and receiving power from the external power source from the main power module when the external power source is normally powered, and externally When the power supply stops supplying power, the stored power is supplied to the power module; a first bypass unit is connected in parallel to the first power storage unit, and a first bypass path is provided to limit the main power module to be provided a voltage value of the first power storage unit, the first bypass unit has a first control end, and the first control end is electrically connected to the external power source to selectively turn on the first power source according to whether the external power source is normally powered a bypass path; a second power storage unit electrically connected to the first power storage unit, receiving power from the external power source from the main power module when the external power source is normally powered, and stopping power supply from the external power source Time Providing stored power to the power module; and a second bypass unit parallel to the second power storage unit and providing a second bypass path to limit the main power module to the second storage The voltage value of the electric unit, the second bypass unit has a second control end, and the second control end is electrically connected to the external power The source selectively turns on the second bypass path according to whether the external power source is normally powered. The electronic device with a backup power source according to claim 1, wherein the first bypass unit and the second bypass unit distribute the power provided by the external power source evenly to the first storage when the external power supply is normally powered An electric unit and the second electric storage unit. The electronic device with a backup power supply according to claim 1, wherein the first bypass unit includes a first bypass resistor and a first bypass switch, and the second bypass unit includes a second bypass resistor and a second bypass switch, the first bypass switch and the second bypass switch are selectively turned on according to whether the external power source is normally powered, wherein the first bypass switch and the first bypass switch are The second bypass switch is turned on, the voltage difference between the two bypass resistors is related to the voltage value provided by the main power module to the first power storage unit, and the voltage difference across the second bypass resistor is associated with the main The voltage value supplied by the power module to the second power storage unit. The electronic device of claim 3, wherein the first bypass switch has a first end, a second end, and the first control end, and the first end of the first bypass switch is electrically Connected to one end of the first power storage unit, the second end of the first bypass switch is electrically connected between the first power storage unit and the second power storage unit, the first bypass switch The first control terminal is electrically connected to the main power module to receive power from the external power source. The second bypass switch has a first end, a second end, and the second control end, and the second bypass switch The first end is electrically connected between the first power storage unit and the second power storage unit, and the second end of the second bypass switch is electrically connected to a reference end, the second bypass switch The second control terminal is electrically connected to the main power module to receive power from the external power source. The electronic device with the backup power supply according to claim 4 further includes a voltage dividing module, wherein the voltage dividing module receives power supply from the external power source, the first control end of the first bypass switch and the second The second control end of the bypass switch is electrically connected to a voltage dividing node of the voltage dividing module. The electronic device with the backup power supply according to claim 1 further has a first anti-backflow component electrically connected between the first power storage unit and the power module. The electronic device with the backup power supply of claim 1 further includes a second anti-backflow component and a current limiting resistor electrically connected between the first power storage unit and the main power module. The electronic device with a backup power supply according to claim 1, wherein the power module includes a processing unit, and when the electronic device receives power from the external power source, the processing unit is charged according to the first power storage unit. A curve determines the capacitance of the first power storage unit. The electronic device with the backup power source as claimed in claim 8, wherein when the processing unit determines that the capacity of the first power storage unit is lower than a threshold, an alert signal is generated. An electronic device with a backup power source according to claim 8, wherein when the electronic device performs a shutdown process, the power module is turned off after an extended length of time, and when the processing unit determines the first storage unit The processing unit reduces the length of time when the capacitance is below a threshold. A method for charging and discharging a backup power source is applicable to an electronic device having a backup power source, the electronic device is electrically connected to an external power source, and has a power module and a standby power module, and the backup power module includes a first power storage unit and a second power storage unit, the bypass path includes a first bypass path corresponding to the first power storage unit and a second bypass path corresponding to the second power storage unit, The charging and discharging method of the backup power source includes the following steps: When the external power source is normally powered, the power supply of the external power source is provided to the power module and the standby power module; when the standby power module is charged by the power supply of the external power source, the standby power module is turned on a bypass path for limiting a voltage value that is supplied to the standby power module; when the external power source stops supplying power, the bypass path is not turned on, and the standby power module supplies the stored power to the power module And when the first power storage unit and the second power storage unit are charged by the power supply of the external power source, turning on the first bypass path and the second bypass path to allocate the external power supply to the first The power of the power storage unit and the second power storage unit. The charging and discharging method of the standby power source according to claim 11, wherein the power supply supplied to the first power storage unit and the second power storage unit by the external power source is evenly distributed. The charging and discharging method of the standby power source according to claim 11, further comprising the step of: when the electronic device receives the power supply of the external power source, according to at least one of the first power storage unit and the second power storage unit And a charging curve, determining a capacitance of at least one of the first power storage unit and the second power storage unit. The charging and discharging method of the backup power source according to claim 13, further comprising the step of: generating a warning when determining that the capacity of at least one of the first power storage unit and the second power storage unit is lower than a threshold value Signal. The method for charging and discharging the backup power source according to claim 13 further includes the following steps: When the electronic device performs a shutdown process, the power module is turned off after an extended length of time, and when the capacitance of the first power storage unit is lower than a threshold, the length of the extended time is reduced.