Circuit structure for prolonging service time of RTC battery

Abstract

The utility model provides a circuit structure for prolonging the service life of an RTC battery, which can prolong the service life of the RTC battery, reduce the maintenance cost and improve the normal operation efficiency of a system. Comprising an RTC battery module, an RTC clock module and a low electric quantity detection alarm module, the RTC battery module comprises an RTC battery, and the RTC battery module is connected with an external power supply and is used for continuously supplying power to the RTC clock module according to power supply of the external power supply and the RTC battery; the RTC clock module is connected with the RTC battery module and the electronic equipment and is used for providing a stable time reference for the electronic equipment; and the low electric quantity detecting and alarming module is connected with the RTC battery module and is used for detecting the electric quantity of the RTC battery and alarming the low electric quantity.

Description

Technical Field

[0001] This utility model relates to the field of RTC battery technology, specifically to a circuit structure for extending the usage time of an RTC battery. Background Technology

[0002] In computer systems, the main functions of the RTC battery are: 1. Maintaining system time: When the system is powered off or the main power is shut down, it continues to supply power to the clock chip, ensuring continuous system time updates and preventing time loss or reset after a power outage, which would affect functions such as file timestamps and system logs; 2. Saving BIOS settings, such as boot order and hardware configuration. Without an RTC battery, these settings would be lost after a power outage, reverting to default values; 3. Preventing system startup problems: If the RTC battery is depleted, BIOS settings may be lost, leading to errors or failure to boot the system. In personal consumer products... For devices like laptops and desktops, replacing the RTC battery when it runs out is relatively simple and has minimal impact. However, in industrial applications such as power systems and rail transit systems, complex systems with numerous cabinets and circuit boards, each with its own RTC battery, make battery replacement more cumbersome and significantly impact system efficiency. Therefore, system designers must consider the lifespan of the RTC batteries on the circuit boards and minimize the frequency of battery replacements to reduce system maintenance costs. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a circuit structure for extending the lifespan of an RTC battery, which can extend the battery's lifespan, reduce maintenance costs, and improve the efficiency of normal system operation.

[0004] This utility model adopts the following technical solution: a circuit structure for extending the usage time of an RTC battery, comprising an RTC battery module, an RTC clock module, and a low battery detection alarm module, wherein...

[0005] The RTC battery module includes an RTC battery, which is connected to an external power source and is used to continuously power the RTC clock module according to the power supply of the external power source and the RTC battery.

[0006] The RTC clock module is connected to both the RTC battery module and the electronic device, and is used to provide a stable time reference for the electronic device.

[0007] The low battery detection and alarm module is connected to the RTC battery module and is used to detect the power level of the RTC battery and issue a low battery alarm.

[0008] Furthermore, the RTC battery module includes resistors R1 and R2, Zener diodes D1-D3, capacitors C1 and C2, and a battery holder BH1. The RTC battery is mounted on the battery holder BH1. One end of resistor R1 is connected to the positive terminal of Zener diode D2, and the other end of resistor R1 is connected to the power supply output terminal +V3.3A of an external power source. The negative terminal of Zener diode D2 is connected to one end of capacitor C1 and the positive terminal of Zener diode D1. The negative terminal of Zener diode D1 is connected to one end of capacitor C2 and the negative terminal of Zener diode D3. The other ends of capacitors C1 and C2 are grounded. The positive terminal of Zener diode D3 is connected to one end of resistor R2, and the other end of resistor R2 is connected to one end of the battery holder BH1. The other end of the battery holder BH1 is grounded.

[0009] Furthermore, the capacitor C1 is a supercapacitor;

[0010] Furthermore, the RTC clock module includes resistors R3-R5, Zener diodes D4 and D5, capacitors C3-C5, and a clock chip U1. The clock chip U1 is an INS5902B clock chip. The positive terminal of the Zener diode D4 is connected to one end of the capacitor C4 and then connected to the power supply output terminal +V 3.3A. The negative terminal of the Zener diode D4 is connected to one end of resistors R4 and R5, the negative terminal of the Zener diode D5, and pin 2 of the clock chip U1. The positive terminal of the Zener diode D5 is connected to... The other end of resistor R4 and one end of capacitor C3 are connected to one end of capacitor C1. The other ends of capacitors C3 and C4 are grounded. One end of resistor R3 is connected to pin 1 of clock chip U1. The other end of resistor R5 is connected to one end of capacitor C5, pin 3 of clock chip U1, and the negative terminal of Zener diode D1. The other end of resistor R3 is connected to the other end of capacitor C5 and then grounded. Pins 5 and 7 of clock chip U1 are connected to the electronic device.

[0011] Furthermore, the low battery detection alarm module includes resistors R6 to R10, capacitor C6, and comparator U2. One end of resistor R6 is connected to the positive terminal of the Zener diode D3. One end of resistor R8 is connected to the power supply output terminal +V3.3A. The other end of resistor R6 is connected to one end of resistor R7 and pin 3 of comparator U2. The other end of resistor R8 is connected to one end of resistor R9 and pin 4 of comparator U2. The other ends of resistors R7 and R9 are grounded. Pin 5 of comparator U2 is connected to one end of capacitor C6 and one end of resistor R10 and then connected to the power supply output terminal +V3.3A. The other end of capacitor C6 is grounded. Pin 1 of comparator U2 is connected to the other end of resistor R10.

[0012] The beneficial effects of this utility model are that, when the RTC battery module is connected to an external power source, the RTC battery module can continuously power the RTC clock module through the power supply of the external power source and the RTC battery, which can not only extend the usage time of the RTC battery, but also provide a stable time reference for electronic devices; and by setting a low power detection alarm module, the power of the RTC battery can be detected and an alarm can be issued when the power is low, thereby reducing maintenance costs and improving the efficiency of normal system operation, which has good application value. Attached Figure Description

[0013] Figure 1 This is a structural block diagram of the present invention;

[0014] Figure 2 This is the circuit schematic diagram of the RTC battery module of this utility model;

[0015] Figure 3 This is the circuit schematic of the RTC clock module of this utility model;

[0016] Figure 4 This is a circuit diagram of the low battery detection and alarm module of this utility model. Detailed Implementation

[0017] like Figures 1-4 As shown, the circuit structure of this utility model for extending the battery life of an RTC includes an RTC battery module, an RTC clock module, and a low battery detection alarm module, wherein...

[0018] The RTC battery module includes an RTC battery, which is connected to an external power source to continuously power the RTC clock module based on the power supply from the external power source and the RTC battery.

[0019] The RTC clock module is connected to the RTC battery module and electronic devices to provide a stable time reference for the electronic devices.

[0020] The low battery detection and alarm module is connected to the RTC battery module to detect the RTC battery level and issue a low battery alarm.

[0021] The RTC battery module includes resistors R1 and R2, Zener diodes D1-D3, capacitors C1 and C2, and battery holder BH1. Capacitor C1 is a supercapacitor, specifically the BCT005R5C105FS1F supercapacitor from Liaoning Boaige Electronics Technology Co., Ltd. The RTC battery BAT1 is mounted on the battery holder BH1. One end of resistor R1 is connected to the positive terminal of Zener diode D2, and the other end is connected to the external power supply output terminal +V3.3A. The negative terminal of Zener diode D2 is connected to one end of capacitor C1 and the positive terminal of Zener diode D1. The negative terminal of Zener diode D1 is connected to one end of capacitor C2 and the negative terminal of Zener diode D3. The other ends of capacitors C1 and C2 are grounded. The positive terminal of Zener diode D3 is connected to one end of resistor R2, and the other end of resistor R2 is connected to one end of battery holder BH1. The other end of battery holder BH1 is grounded.

[0022] The RTC clock module includes resistors R3-R5, Zener diodes D4 and D5, capacitors C3-C5, and clock chip U1. Clock chip U1 is an INS5902B, an ultra-low-power real-time clock chip with a built-in 32.768kHz crystal oscillator, a high-precision temperature sensor, and temperature compensation circuitry. It automatically adjusts clock accuracy, has an I2C communication interface, and supports multiple functions such as calendar (year, month, day, hour, minute, second) and clock timing. The positive terminal of Zener diode D4 is connected to one end of capacitor C4 and then to the +V 3.3A power supply output for voltage regulation. The negative terminal of transistor D4 is connected to one end of resistors R4 and R5, the negative terminal of Zener diode D5, and pin 2 of clock chip U1. The positive terminal of Zener diode D5 is connected to the other end of resistor R4, one end of capacitor C3, and then to one end of capacitor C1. The other ends of capacitors C3 and C4 are grounded. One end of resistor R3 is connected to pin 1 of clock chip U1. The other end of resistor R5 is connected to one end of capacitor C5, pin 3 of clock chip U1, and the negative terminal of Zener diode D1. The other end of resistor R3 is connected to the other end of capacitor C5 and then grounded. Pins 5 and 7 of clock chip U1 are connected to electronic equipment.

[0023] The low battery detection alarm module includes resistors R6 to R10, capacitor C6, and comparator U2. One end of resistor R6 is connected to the positive terminal of Zener diode D3. One end of resistor R8 is connected to the power supply output terminal +V3.3A. The other end of resistor R6 is connected to one end of resistor R7 and pin 3 of comparator U2. The other end of resistor R8 is connected to one end of resistor R9 and pin 4 of comparator U2. The other ends of resistors R7 and R9 are grounded. Pin 5 of comparator U2 is connected to one end of capacitor C6 and one end of resistor R10 and then connected to the power supply output terminal +V3.3A. The other end of capacitor C6 is grounded. Pin 1 of comparator U2 is connected to the other end of resistor R10.

[0024] When an external power supply is applied, an operating voltage will be generated, namely +V3.3A at the power supply output terminal of the external power supply.

[0025] The BATT shown in the diagram is actually the power supply voltage generated by the RTC battery BAT1.

[0026] The +V3.3_CAP in the diagram is actually the voltage generated by capacitor C1 after it is charged;

[0027] VCC_CR2032 in the diagram is actually the voltage of the RTC battery BAT1;

[0028] The function of resistor R5 is to prevent abnormal RTC timing when the main power supply pin of clock chip U1 switches to the backup power supply pin.

[0029] The function of Zener diodes D2, D3, D4, and D5 is to prevent leakage between the voltages +V3.3A, +V3.3_CAP, and BATT.

[0030] Comparator U2 is an ultra-low power comparator used to detect low battery warnings for the RTC.

[0031] The working principle of this utility model is as follows: when the external power supply is supplied, a working voltage, +V3.3A, is generated and supplied to pin 2 of the clock chip U1 (i.e., the main power supply pin of the clock chip U1) through the Zener diode D4. At the same time, +V3.3A charges the capacitor C1 through the resistor R1 and the Zener diode D2. The voltage +V3.3_CAP generated by the capacitor C1 after charging is also supplied to pin 2 of the clock chip U1 (i.e., the main power supply pin of the clock chip U1) through the Zener diode D5. When the external power supply is turned off, the voltage +V3.3_CAP will take over the working voltage +V3.3A to continue to supply power to the clock chip U1.

[0032] The RTC battery BAT1 supplies the power supply voltage BATT generated by resistor R2 and Zener diode D3 to pin 3 of clock chip U1 (i.e., the backup power supply pin of clock chip U1). When the external power supply is cut off and the voltage +V3.3_CAP generated by charging capacitor C1 is also depleted, clock chip U1 will switch from the main power supply pin to the backup power supply pin to supply power to clock chip U1 (at this time, the voltage BATT generated by RTC battery BAT1 supplies power to clock chip U1), so that clock chip U1 can continue to work.

[0033] Pin 3 of comparator U2 is connected to the voltage VCC_CR2032 of RTC battery BAT1, and pin 4 of comparator U2 is connected to the operating voltage +V3.3A. The operating voltage +V3.3A is divided by resistors R8 and R9. When the charge of RTC battery BAT1 is higher than the divided voltage, pin 1 of comparator U2 outputs a high-level signal. When the charge of RTC battery BAT1 is lower than the divided voltage, pin 1 of comparator U2 outputs a low-level signal. The output signal BATT_LOW# is connected to the lower-level CPU or bridge chip as a low-battery alarm indication signal.

[0034] In summary, the circuit design of this utility model is simple, safe, reliable, convenient, and easy to operate. By alternating the voltages +V3.3A, +V3.3_CAP, and BATT, the usage time of the RTC battery can be extended, and it also has an RTC battery low power alarm to facilitate timely replacement of the RTC battery.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 circuit structure for extending the battery life of an RTC (Remote Control Center), characterized in that: This includes an RTC battery module, an RTC clock module, and a low battery detection alarm module. The RTC battery module includes an RTC battery, which is connected to an external power source and is used to continuously power the RTC clock module according to the power supply of the external power source and the RTC battery. The RTC clock module is connected to both the RTC battery module and the electronic device, and is used to provide a stable time reference for the electronic device. The low battery detection and alarm module is connected to the RTC battery module and is used to detect the power level of the RTC battery and issue a low battery alarm.

2. The circuit structure for extending the usage time of an RTC battery according to claim 1, characterized in that: The RTC battery module includes resistors R1 and R2, Zener diodes D1-D3, capacitors C1 and C2, and a battery holder BH1. The RTC battery is mounted on the battery holder BH1. One end of resistor R1 is connected to the positive terminal of Zener diode D2, and the other end of resistor R1 is connected to the power supply output terminal +V3.3A of an external power source. The negative terminal of Zener diode D2 is connected to one end of capacitor C1 and the positive terminal of Zener diode D1. The negative terminal of Zener diode D1 is connected to one end of capacitor C2 and the negative terminal of Zener diode D3. The other ends of capacitors C1 and C2 are grounded. The positive terminal of Zener diode D3 is connected to one end of resistor R2, and the other end of resistor R2 is connected to one end of the battery holder BH1. The other end of the battery holder BH1 is grounded.

3. The circuit structure for extending the usage time of an RTC battery according to claim 2, characterized in that: The capacitor C1 is a supercapacitor.

4. The circuit structure for extending the usage time of an RTC battery according to claim 2, characterized in that: The RTC clock module includes resistors R3-R5, Zener diodes D4 and D5, capacitors C3-C5, and a clock chip U1. The clock chip U1 is an INS5902B clock chip. The positive terminal of Zener diode D4 is connected to one end of capacitor C4 and then to the power supply output terminal +V 3.3A. The negative terminal of Zener diode D4 is connected to one end of resistors R4 and R5, the negative terminal of Zener diode D5, and pin 2 of clock chip U1. The positive terminal of Zener diode D5 is connected to the power supply output terminal +V 3.3A. The other end of resistor R4 and one end of capacitor C3 are connected to one end of capacitor C1. The other ends of capacitors C3 and C4 are grounded. One end of resistor R3 is connected to pin 1 of clock chip U1. The other end of resistor R5 is connected to one end of capacitor C5, pin 3 of clock chip U1, and the negative terminal of Zener diode D1. The other end of resistor R3 is connected to the other end of capacitor C5 and then grounded. Pins 5 and 7 of clock chip U1 are connected to the electronic device.

5. The circuit structure for extending the usage time of an RTC battery according to claim 2, characterized in that: The low battery detection alarm module includes resistors R6 to R10, capacitor C6, and comparator U2. One end of resistor R6 is connected to the positive terminal of Zener diode D3. One end of resistor R8 is connected to the power supply output terminal +V3.3A. The other end of resistor R6 is connected to one end of resistor R7 and pin 3 of comparator U2. The other end of resistor R8 is connected to one end of resistor R9 and pin 4 of comparator U2. The other ends of resistors R7 and R9 are grounded. Pin 5 of comparator U2 is connected to one end of capacitor C6 and one end of resistor R10 and then connected to the power supply output terminal +V3.3A. The other end of capacitor C6 is grounded. Pin 1 of comparator U2 is connected to the other end of resistor R10.

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