Standby battery power supply switching circuit

Abstract

The utility model discloses a standby battery power supply switching circuit, which relates to the field of power supply, and comprises an on-board power supply module used for outputting 3.3 V voltage to supply power to an RTC chip when an external power supply exists; the standby battery module is used for placing standby batteries, and the standby batteries comprise rechargeable standby batteries and non-rechargeable standby batteries; and the selection circuit module is used for charging the rechargeable standby battery when the standby battery is the rechargeable standby battery and the on-board power supply module outputs 3.3 V voltage. Compared with the prior art, the beneficial effects of the utility model are that the selection circuit module is connected with a resistor R21 or a diode D2; convenient switching between a rechargeable standby battery and a non-rechargeable standby battery is achieved, a selection circuit module is designed on a mainboard, two mainboards are not needed for implementation, the hardware model of the mainboard is simplified, and stock inventory is optimized; maintenance of mainboard models in production is reduced, and production management resources are saved.

Description

Technical Field

[0001] The utility model relates to the field of power supply, in particular to a backup battery power supply switching circuit. Background Art

[0002] At present, the clock circuits with backup battery power supply on Android motherboards in the market are used to save the system time when there is no external power supply to the motherboard. The backup batteries are divided into two types: rechargeable and non-rechargeable, and the corresponding power supply circuits are different. They are respectively shown as Figure 1 、 Figure 2 shown.

[0003] Many Android motherboards are designed with these two power supply circuits of rechargeable or non-rechargeable, resulting in two versions of the motherboard, causing a large number of models and an increase in production and inventory, which needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a backup battery power supply switching circuit to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A backup battery power supply switching circuit includes:

[0007] A power supply module on the board, which is used to output a 3.3V voltage to supply power to the RTC chip when there is an external power supply;

[0008] A backup battery module, which is used to place backup batteries, including rechargeable backup batteries and non-rechargeable backup batteries;

[0009] A selection circuit module, which is used to charge the rechargeable backup battery when the power supply module on the board outputs a 3.3V voltage when the backup battery is a rechargeable backup battery, and the rechargeable backup battery supplies power to the RTC chip module when the power supply module on the board does not output a voltage; when the backup battery is a non-rechargeable backup battery, the non-rechargeable backup battery does not charge when the power supply module on the board outputs a 3.3V voltage, and the non-rechargeable backup battery supplies power to the RTC chip module when the power supply module on the board does not output a voltage;

[0010] An RTC chip module, which is used as a time running circuit, and the CPU system obtains the time through the communication bus;

[0011] The power supply module on the board is connected to the selection circuit module and the RTC chip module, and the backup battery module is connected to the selection circuit module and the RTC chip module.

[0012] As a further solution of the present utility model: The power supply module on the board includes a diode D1. The positive electrode of the diode D1 is connected to an external power supply, and the negative electrode of the diode D1 is connected to a selection circuit module and an RTC chip module.

[0013] As a further solution of the present utility model: When the backup battery is a rechargeable backup battery, the selection circuit module includes a socket J3 and a resistor R21. The socket J3 is inserted with the rechargeable backup battery. One end of the socket J3 is connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the power supply module on the board and the RTC chip module.

[0014] As a further solution of the present utility model: When the backup battery is a non-rechargeable backup battery, the selection circuit module includes a socket J3 and a diode D2. The socket J3 is inserted with the non-rechargeable backup battery. The positive electrode of the socket J3 is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the power supply module on the board and the RTC chip module.

[0015] As a further solution of the present utility model: The RTC chip module includes a clock chip U2, and the model of the clock chip U2 is PCF8563T. The 8th pin of the clock chip U2 is connected to the power supply module on the board and the selection circuit module. The 1st pin of the clock chip U2 is connected to one end of a crystal X1, one end of a resistor R22, and one end of a capacitor C7. The 2nd pin of the clock chip U2 is connected to the other end of the crystal X1, the other end of the resistor R22, and one end of a capacitor C8. The other end of the capacitor C7 is grounded, and the other end of the capacitor C8 is grounded.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: By connecting a resistor R21 or a diode D2 in the selection circuit module, the present utility model realizes the convenient switching between rechargeable and non-rechargeable backup batteries. The selection circuit module is designed on the main board, eliminating the need for two types of main boards, simplifying the main board hardware model, and optimizing the stock inventory; reducing the maintenance of the main board model during production and saving production management resources. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a rechargeable backup battery in the prior art.

[0018] Figure 2 It is a schematic diagram of a non-rechargeable backup battery in the prior art.

[0019] Figure 3 It is a circuit diagram of a power supply switching circuit for a backup battery. Detailed Embodiment

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figure 3 , a backup battery power supply switching circuit, comprising:

[0022] A power supply module on the board, used to output a 3.3V voltage to supply power to the RTC chip when there is an external power supply;

[0023] A backup battery module, used to place backup batteries, and the backup batteries include rechargeable backup batteries and non-rechargeable backup batteries;

[0024] A selection circuit module, used to charge the rechargeable backup battery when the backup battery is a rechargeable backup battery and the power supply module on the board outputs a 3.3V voltage, and the rechargeable backup battery supplies power to the RTC chip module when the power supply module on the board does not output a voltage; when the backup battery is a non-rechargeable backup battery, the non-rechargeable backup battery does not charge when the power supply module on the board outputs a 3.3V voltage, and the non-rechargeable backup battery supplies power to the RTC chip module when the power supply module on the board does not output a voltage;

[0025] An RTC chip module, used as a time running circuit, and the CPU system obtains the time through a communication bus;

[0026] The power supply module on the board is connected to the selection circuit module and the RTC chip module, and the backup battery module is connected to the selection circuit module and the RTC chip module.

[0027] In this embodiment: Please refer to Figure 3 , the power supply module on the board includes a diode D1, the positive electrode of the diode D1 is connected to the external power supply, and the negative electrode of the diode D1 is connected to the selection circuit module and the RTC chip module.

[0028] When there is an external power supply, the 3.3V network name on the board power supply is VCC3V3_SYS. When there is an external power supply, the 3.3V power supply supplies power to the RTC chip module through the diode D1.

[0029] In this embodiment: Please refer to Figure 3 , when the backup battery is a rechargeable backup battery, the selection circuit module includes a socket J3 and a resistor R21. The socket J3 inserts the rechargeable backup battery, one end of the socket J3 is connected to the resistor R21, and the other end of the resistor R21 is connected to the power supply module on the board and the RTC chip module.

[0030] At this time Figure 3 When the diode D2 is not connected and the external power supply VCC3V3_SYS exists, VCC3V3_SYS supplies power to the RTC chip module and also supplies power to the rechargeable backup battery through the resistor R21. When the external power supply VCC3V3_SYS does not exist, the rechargeable backup battery supplies power to the RTC chip module through the resistor R21.

[0031] In this embodiment: Please refer to Figure 3 , when the backup battery is a non-rechargeable backup battery, the selection circuit module includes a socket J3 and a diode D2. The socket J3 inserts the non-rechargeable backup battery. The socket J3 is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the on-board power module and the RTC chip module.

[0032] At this time Figure 3 When the resistor R21 is not connected and the external power supply VCC3V3_SYS exists, VCC3V3_SYS supplies power to the RTC chip module. Due to the presence of the diode D2, it does not supply power to the non-rechargeable backup battery. When the external power supply VCC3V3_SYS does not exist, the non-rechargeable backup battery supplies power to the RTC chip module through the diode D2.

[0033] In this embodiment: Please refer to Figure 3 , the RTC chip module includes a clock chip U2. The model of the clock chip U2 is PCF8563T. The 8th pin of the clock chip U2 is connected to the on-board power module and the selection circuit module. The 1st pin of the clock chip U2 is connected to one end of the crystal X1, one end of the resistor R22, and one end of the capacitor C7. The 2nd pin of the clock chip U2 is connected to the other end of the crystal X1, the other end of the resistor R22, and one end of the capacitor C8. The other end of the capacitor C7 is grounded, and the other end of the capacitor C8 is grounded.

[0034] The 1st and 2nd pins of the clock chip U2 are externally connected to an oscillator circuit. The crystal X1 - 32.768KHz, the capacitor C7 - 12pF, the capacitor C8 - 12pF, and the resistor R22 - 1M ohm are used to provide an oscillation frequency of 32.768KHz for the chip. The 3rd, 5th, 6th, and 7th pins of the clock chip U2 are control and communication signals, which are connected to the system CPU. The 8th pin is the power supply pin of the clock chip U2.

[0035] The working principle of the present utility model is as follows: The power supply module on the board is used to output a 3.3V voltage to power the RTC chip when there is an external power supply; the backup battery module is used to place backup batteries, and the backup batteries include rechargeable backup batteries and non-rechargeable backup batteries; the selection circuit module is used to charge the rechargeable backup battery when the backup battery is a rechargeable backup battery and the power supply module on the board outputs a 3.3V voltage, and when the power supply module on the board does not output a voltage, the rechargeable backup battery powers the RTC chip module; when the backup battery is a non-rechargeable backup battery, the non-rechargeable backup battery does not charge when the power supply module on the board outputs a 3.3V voltage, and when the power supply module on the board does not output a voltage, the non-rechargeable backup battery powers the RTC chip module; the RTC chip module is used as a time running circuit, and the CPU system obtains the time through the communication bus.

[0036] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive.

[0037] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A backup battery-powered switching circuit, characterized in that, The backup battery-powered switching circuit includes: A board power supply module for outputting a 3.3V voltage to power the RTC chip when there is an external power supply. A backup battery module for placing backup batteries, including rechargeable backup batteries and non-rechargeable backup batteries. A selection circuit module for charging the rechargeable backup battery when the backup battery is a rechargeable backup battery and the board power supply module outputs a 3.3V voltage, and for powering the RTC chip module with the rechargeable backup battery when the board power supply module does not output a voltage; when the backup battery is a non-rechargeable backup battery, the non-rechargeable backup battery does not charge when the board power supply module outputs a 3.3V voltage, and the non-rechargeable backup battery powers the RTC chip module when the board power supply module does not output a voltage. An RTC chip module for serving as a time running circuit, and the CPU system obtains the time through a communication bus. The board power supply module is connected to the selection circuit module and the RTC chip module, and the backup battery module is connected to the selection circuit module and the RTC chip module.

2. The backup battery-powered switching circuit according to claim 1, wherein The board power supply module includes a diode D1. The positive pole of the diode D1 is connected to the external power supply, and the negative pole of the diode D1 is connected to the selection circuit module and the RTC chip module.

3. The backup battery power supply switching circuit according to claim 2, characterized in that, When the backup battery is a rechargeable backup battery, the selection circuit module includes a socket J3 and a resistor R21. The socket J3 inserts the rechargeable backup battery, the socket J3 is connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the board power supply module and the RTC chip module.

4. The backup battery-powered switching circuit according to claim 2, wherein When the backup battery is a non-rechargeable backup battery, the selection circuit module includes a socket J3 and a diode D2. The socket J3 inserts the non-rechargeable backup battery, the socket J3 is connected to the positive pole of the diode D2, and the negative pole of the diode D2 is connected to the board power supply module and the RTC chip module.

5. The backup battery-powered switching circuit according to any one of claims 1 to 4, characterized in that The RTC chip module includes a clock chip U2 with the model PCF8563T. The 8th pin of the clock chip U2 is connected to the board power supply module and the selection circuit module. The 1st pin of the clock chip U2 is connected to one end of a crystal X1, one end of a resistor R22, and one end of a capacitor C7. The 2nd pin of the clock chip U2 is connected to the other end of the crystal X1, the other end of the resistor R22, and one end of a capacitor C8. The other end of the capacitor C7 is grounded, and the other end of the capacitor C8 is grounded.

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