TWI452749B - Power supply equipment and a discharge method thereof - Google Patents

Description

Power supply device and discharge method thereof

The present invention relates to a power supply device and a discharge method thereof, and more particularly to a power supply device that can be fully discharged and a discharge method thereof.

With the rapid development of technology, more and more electronic devices appear in people's daily lives. Electronic devices such as mobile phones, PDAs (Personal Digital Assistants), laptops, etc. have become important communication and entertainment in people's lives. tool. These electronic devices are generally powered by a rechargeable battery that can be recharged and discharged.

In use, the battery output voltage generally needs to reach a better supply voltage, and the power supply at the preferred supply voltage can make the electronic device in an optimal working state. On the other hand, as the battery discharge continues, the battery output voltage will also decrease. In general, the battery also has a discharge cut-off voltage. When the output voltage drops to the discharge cut-off voltage, if the output voltage continues to be output, it will cause over discharge (Over Discharge), which may cause battery leakage. To shorten its service life. Obviously, for normal use of the battery, the preferred supply voltage should be greater than the cutoff voltage.

In the process of using the power supply device, in order to prevent battery damage caused by over-discharge, usually when the output voltage of the battery is slightly lower than the above-mentioned preferred supply voltage and does not fall to the above-mentioned cut-off voltage, the external discharge is interrupted, and accordingly, the user The operation of the electronic device is also due to This was interrupted. However, at this time, the battery generally does not reach the discharge cut-off voltage, and also has a certain amount of remaining power that cannot be utilized, so that the power is not fully utilized, that is, it needs to be recharged, thereby causing waste.

In view of this, it is necessary to provide a power supply device that can be fully discharged.

In addition, it is necessary to provide a discharge method of the above power supply device.

A power supply device for supplying power to an electronic device, the power supply device comprising a battery for outputting a voltage, having a preferred supply voltage for power supply and a cutoff voltage for discharging; the power supply device further comprising a voltage adjustment unit The voltage adjusting unit is electrically connected to the battery; the output voltage of the battery can be obtained, and when the output voltage is between the preferred supply voltage and the cutoff voltage, it is converted into a preferred supply voltage for use by the electronic device.

A method for discharging a power supply device, the method comprising the steps of: providing a power supply device as described above, using the power supply device to discharge externally; determining whether the output voltage reaches a preferred supply voltage; adjusting the output voltage according to the judgment result, and outputting or directly Output.

Compared with the prior art, the power supply device of the present invention allows the electronic device to fully utilize the stored power by the voltage adjusting unit to make the output voltage of the power supply device continue to the preferred supply voltage until discharging to the cutoff voltage.

100‧‧‧Power supply unit

10‧‧‧Battery

20‧‧‧Battery protection unit

21‧‧‧Protection wafer

22‧‧‧Switch unit

30‧‧‧Voltage adjustment unit

31‧‧‧Voltage comparison unit

32‧‧‧Boost unit

40‧‧‧Power Management Unit

1 is a functional block diagram of a power supply device in accordance with a preferred embodiment of the present invention.

2 is a flow chart showing the operation of the power supply device of the preferred embodiment of the present invention.

The present invention discloses a power supply device that can connect and power an electronic device such as a mobile phone, a PDA (Personal Digital Assistant), a notebook computer, and the like.

Referring to FIG. 1 , the power supply device 100 includes a battery 10 , a battery protection unit 20 , a voltage adjustment unit 30 , and a power management unit 40 .

The battery 10 can be a rechargeable battery, such as a lithium battery, etc., which can provide power for the electronic device. When the battery 10 is normally powered, the output voltage should be greater than a preferred power supply voltage, such as a better power supply for a lithium battery. The lowest voltage is typically 3.6V. At the same time, the battery 10 also has a cut-off voltage for preventing overdischarge, for example, the cut-off voltage of the lithium battery is generally 2.5V. Moreover, the maximum voltage of the battery 10 does not exceed the safe voltage of the electronic device, for example, the lithium battery is generally 4.2V.

The battery protection unit 20 is configured to detect the output voltage of the battery 10, and when the output voltage of the battery 10 drops to the cutoff voltage, interrupt the battery 10 to discharge externally to avoid over-discharge and damage. The battery protection unit 20 includes a protection wafer 21 and a switch unit 22 electrically connected in sequence.

The protection wafer 21 is used to detect the output voltage of the battery 10. The protection wafer 21 can be preset with a discharge protection voltage, which can be the cut-off voltage of the battery 10 described above. When the output voltage of the battery 10 drops to the discharge protection voltage, that is, to the cutoff voltage of the battery 10, the protection wafer 21 can send a control signal to the switching unit 22 to turn it off.

The switch unit 22 is for controlling the battery 10 to discharge to the outside. The switch unit 22 is in an on state. When it receives the control signal of the protection chip 21, that is, when the output voltage of the battery 10 falls to the cutoff voltage, it can be automatically turned off, thereby interrupting the power. The cell 10 is externally discharged to avoid overdischarge of the battery 10.

The voltage adjustment unit 30 is configured to compare the output voltage of the battery 10 with a preferred supply voltage when the power is supplied, and convert the output voltage to a preferred supply voltage to the power management unit when the output voltage is less than the preferred supply voltage. 40. The voltage adjustment unit 30 includes a voltage comparison unit 31 and a boost unit 32 that are electrically connected.

One end of the voltage comparison unit 31 is electrically connected to the battery protection unit 20, and the other end is electrically connected to the power management unit 40 for comparing the output voltage of the battery 10 with a preferred supply voltage when the power is supplied. The voltage comparison unit 31 can preset a reference voltage, which is a preferred supply voltage for the power supply of the battery 10. When the output voltage of the battery 10 reaches a preferred supply voltage, the voltage comparison unit 20 directly transmits the output voltage. To the power management unit 40; when the output voltage of the battery 10 does not reach the preferred supply voltage, a control signal is sent to the boosting unit 32 to activate the boosting unit 32.

One end of the boosting unit 32 is electrically connected to the voltage comparison unit 31, and the other end is electrically connected to the power management unit 40, so that when the output voltage of the battery 10 is between the preferred supply voltage and the cutoff voltage, the output voltage is converted. To the preferred supply voltage, the converted voltage is transmitted to the power management unit 40.

The power management unit 40 is configured to connect the electronic device, and output the output voltage of the battery 10 obtained from the voltage comparator 31 and the output voltage converted by the boosting unit 32 to the electronic device.

Referring to FIG. 2 together, the workflow of discharging the power supply device 100 includes the following steps:

Step S1: The battery 10 is used to start external discharge, and a voltage is output to supply power to the electronic device.

Step S2: The output voltage of the battery 10 is detected using the protective wafer 21.

Step S3: Using the protection wafer 21, it is determined whether the output voltage is greater than the cutoff voltage of the battery 10. If not, the process proceeds to step S4; if yes, the process proceeds to step S6.

Step S4: The control wafer 21 is used to transmit a control signal to the switching unit 22 to turn it off, thereby preventing the battery 10 from being over-discharged, and proceeds to step S5.

Step S5: The switch unit 22 automatically disconnects after receiving the control signal of the protection chip 21 to interrupt the external power supply of the battery 10, and the power management unit 40 stops outputting the voltage, thereby ending the entire discharge process.

Step S6: The voltage comparison unit 31 obtains the output voltage of the battery 10, and further determines whether the output voltage reaches the preferred power supply voltage for the battery 10, and if not, proceeds to step S7, and if so, proceeds directly to step S8.

Step S7: When the voltage does not reach the preferred supply voltage, it needs to be adjusted for use by the electronic device. The specific adjustment method is: the voltage comparison unit 31 sends a control signal to activate the boosting unit 32, and the boosting unit 32 converts the output voltage of the battery 10 to a preferred supply voltage, and proceeds to step S8.

Step S8: The output voltage is transmitted to the power management unit 40.

Step S9: The power management unit 40 outputs the voltage, and returns to step S2.

It can be understood that the preset discharge protection voltage of the protection wafer 21 can also be greater than the cutoff voltage, and the discharge of the battery 10 to the discharge protection voltage is completed.

The power supply device 100 of the present invention allows the output voltage to continue to a preferred supply voltage by the overvoltage protection of the battery protection unit 20 and the boosting action of the voltage adjustment unit 30 until the battery 10 is discharged to the cutoff voltage, thereby allowing the battery 10 to be in use. Can be fully discharged , extend the power supply time.

In addition, various modifications, additions and substitutions in the form and details may be made by those skilled in the art in the scope of the invention. It is a matter of course that various modifications, additions and substitutions made in accordance with the spirit of the invention are included in the scope of the invention as claimed.

100‧‧‧Power supply unit

10‧‧‧Battery

20‧‧‧Battery protection unit

21‧‧‧Protection wafer

22‧‧‧Switch unit

30‧‧‧Voltage adjustment unit

31‧‧‧Voltage comparison unit

32‧‧‧Boost unit

40‧‧‧Power Management Unit

Claims (7)

A power supply device for supplying power to an electronic device, the power supply device comprising a battery for outputting a voltage, having a preferred supply voltage for supplying power and a cutoff voltage for discharging; the improvement is that the power supply device further includes a voltage adjustment unit and a battery protection unit, the battery protection unit includes a protection chip and a switch unit electrically connected to the battery, the switch unit is electrically connected to the voltage adjustment unit, The protection chip is used to detect the output voltage of the battery, and when it is less than the cutoff voltage, the control switch unit is disconnected; the voltage adjustment unit obtains the output voltage of the battery, and when the output voltage is between the preferred supply voltage and the cutoff voltage, Convert it to a preferred supply voltage for use by the electronic device. The power supply device of claim 1, wherein the voltage adjusting unit comprises a voltage comparing unit and a boosting unit, wherein the voltage comparing unit is electrically connected to the battery to determine whether the output voltage is greater than a preferred power supply. a voltage, and when the output voltage is greater than a preferred supply voltage, outputting the boosting unit when the output voltage is less than the preferred supply voltage; the boosting unit is configured to convert the output voltage when the output voltage is less than the preferred supply voltage For better supply voltage. The power supply device of claim 2, wherein the power supply device further includes a power management unit, wherein the power management unit is electrically connected to the voltage comparison unit and the voltage boosting unit to output a voltage to the electronic device. A method of discharging a power supply device, the method comprising the steps of: providing a power supply device as described above, using the power supply device to discharge externally; determining whether the output voltage reaches a preferred supply voltage; and adjusting the output voltage according to the determination result And an output, which is included when the output voltage is less than the preferred supply voltage, and the boosting unit is activated to convert it into a preferred supply voltage output; When the voltage is greater than the preferred supply voltage, it is directly output. The method of discharging a power supply device according to claim 4, wherein the method further comprises the step of detecting an output voltage after the external discharging step using the power supply device. The method of discharging a power supply device according to claim 5, wherein the method further comprises the step of determining whether the output voltage is greater than the cutoff voltage after the step of detecting the output voltage, and when determining that the output voltage is greater than the cutoff voltage, A step greater than the preferred supply voltage. The method of discharging a power supply device according to claim 4, wherein the method further comprises: after determining whether the output voltage is greater than the cutoff voltage, if the output voltage is less than the cutoff voltage, then opening the switch unit and stopping the output voltage The steps.