Backup power supply circuit of real-time clock and electronic equipment
By introducing a farad capacitor as a backup power supply into the real-time clock circuit, the problem of time recording loss after the main power supply fails was solved, and the stable operation of the RTC under power failure conditions was achieved, ensuring the continuity and accuracy of the system's time recording.
Patent Information
- Application Number
- CN202520239008.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-14
AI Technical Summary
After the main power supply fails, the real-time clock (RTC) cannot be continuously powered, resulting in the loss of time records, which affects the accuracy and continuity of the system. This can lead to data inconsistency or system failure, especially in server clusters.
A supercapacitor is used as a backup power module. An isolation module and a signal processing module supply power to the real-time clock module after the main power is cut off, ensuring the continuity of time recording of the RTC.
In the event of a mains power failure, the supercapacitor provides a stable voltage to the real-time clock module, ensuring that the RTC's time records are not lost and guaranteeing the system's accuracy and continuity.
Smart Images
Figure CN223758040U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of real-time clock power supply, and in particular to a backup power supply circuit for a real-time clock and an electronic device. BACKGROUND
[0002] To ensure the accuracy and continuity of the system, support system wake-up and timing functions, prevent data loss and facilitate event tracing, etc., the device needs to record time through a real-time clock (RTC). After the main power is cut off, the RTC time record still needs to be maintained. For example, in a server cluster, accurate time synchronization is needed between each server to ensure efficient data interaction and task allocation. If the RTC time is inaccurate or lost, it may lead to inconsistent data or system failure.
[0003] The real-time clock (RTC) is crucial in ensuring the accuracy of system time. When the main power is cut off, it is still necessary to ensure that the RTC can continue to maintain time records to avoid data loss. For example, in a server cluster, the coordination between servers relies on accurate time synchronization. If the RTC time deviates or is lost, it may lead to uneven task allocation or data errors.
[0004] However, it is particularly important to maintain the operation of the RTC after the main power is cut off. If the power supply is not effective, the RTC may not function properly, resulting in loss of time records and a series of system problems. Invention content
[0005] To overcome the shortcomings of the prior art, the present application provides a backup power supply circuit for a real-time clock and an electronic device to ensure that the RTC can still operate stably without the support of the main power supply, thereby ensuring the accuracy and continuity of the system and providing reliable support for time-related applications.
[0006] The technical solution adopted by the present application to solve its technical problems is:
[0007] In a first aspect, the present application provides a backup power supply circuit for a real-time clock, comprising: a main power supply, an isolation module, a signal processing module, a backup power supply module, and a real-time clock module; the backup power supply module comprises a farad capacitor;
[0008] The output end of the main power supply is connected to the input end of the isolation module, the output end of the isolation module is connected to the first end of the signal processing module, the second end of the signal processing module is connected to the first end of the backup power supply module, and the second end of the backup power supply module is grounded, for charging the farad capacitor in the backup power supply module through the main power supply;
[0009] The backup power module is also connected to the input end of the backup power module through the signal processing module, and the farad capacitor is used as a backup power supply to provide the working voltage required by the real-time clock module.
[0010] Optionally, the farad capacitor is a 10F farad capacitor.
[0011] Optionally, the isolation module includes a diode.
[0012] The positive electrode of the diode is connected to the output end of the main power supply, and the negative electrode of the diode is connected to the output end of the signal processing module and the real-time clock module, respectively.
[0013] Optionally, the diode is a Schottky diode.
[0014] Optionally, the Schottky diode is of type SS14.
[0015] Optionally, the signal processing module includes a current-limiting resistor and a filter capacitor.
[0016] One end of the current-limiting resistor is connected to the negative electrode of the diode and one end of the filter capacitor, respectively, and the other end of the filter capacitor is grounded.
[0017] The other end of the current-limiting resistor is connected to the first end of the farad capacitor, and the second end of the farad capacitor is grounded.
[0018] The connection between the current-limiting resistor and the diode is also connected to the input end of the real-time clock module.
[0019] Optionally, the resistance value of the current-limiting resistor is 1kΩ.
[0020] Optionally, the voltage output of the main power supply is 5V or 3.3V.
[0021] In a second aspect, the present application provides an electronic device loaded with the backup power supply circuit of the real-time clock.
[0022] The present application has the following beneficial effects: the present application provides a backup power supply circuit of a real-time clock and an electronic device, which includes a main power supply, an isolation module, a signal processing module, a backup power supply module, and a real-time clock module. The backup power supply module contains a farad capacitor, which supplies power to the real-time clock module through the isolation module and the signal processing module after the main power supply is powered off, thereby avoiding the loss of RTC time recording caused by the power failure of the main power supply and ensuring the accuracy and continuity of the system.
[0023] Specifically, the main power supply is connected to the isolation module, and the isolation module isolates and transmits the voltage and current of the main power supply to the first input end of the signal processing module. After receiving the signal of the isolation module, the signal processing module stores the energy provided by the main power supply in the farad capacitor and is connected to the backup power supply module, and at the same time, the farad capacitor can also be connected to the real-time clock module through the loop of the isolation module and the signal processing module. At this time, the farad capacitor can provide stable and safe voltage for the real-time clock module as a backup power supply. When the main power supply is powered off, the farad capacitor supplies power to the real-time clock module through the isolation module and the signal processing module, thereby maintaining the time record of the RTC.
[0024] By adopting the above technical scheme, it can be ensured that the RTC can still operate stably without the support of the main power supply, thereby guaranteeing the accuracy and continuity of the system and providing reliable support for time-related applications. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 is a module connection diagram of the backup power supply circuit of the real-time clock provided by the embodiment of the present application.
[0026] Figure 2 is a circuit principle diagram of the backup power supply circuit of the real-time clock provided by the embodiment of the present application. DETAILED DESCRIPTION
[0027] The present application will be further described below in combination with the drawings and embodiments.
[0028] The concept, specific structure and technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, all the coupling / connection relations involved in the patent do not mean that the components are directly connected, but that the more optimal coupling structure can be composed by adding or reducing the coupling auxiliary components according to the specific implementation situation. The technical features in the creation of the present application can be interactively combined without mutual contradiction and conflict.
[0029] REFERENCE Figure 1 , Figure 1 is a module connection diagram of the backup power supply circuit of the real-time clock provided by the embodiment of the present application. As can be seen, the backup power supply circuit of the real-time clock provided by the present application comprises a main power supply, an isolation module, a signal processing module, a backup power supply module and a real-time clock module. The backup power supply module comprises a farad capacitor.
[0030] Wherein, the farad capacitor is a kind of energy storage element between traditional capacitor and battery, with the following characteristics:
[0031] Large capacity: the capacity can reach hundreds to thousands of farad;
[0032] Fast charging and discharging speed: can complete charging and discharging in a short time;
[0033] Low internal resistance: can provide larger instantaneous current;
[0034] Long service life: the number of charging and discharging cycles can reach hundreds of thousands of times;
[0035] Wide operating temperature range: usually can work in the range of-40℃ to +65℃.
[0036] On this basis, the application proposes that the characteristics of farad capacitor can be used as the backup power supply of RTC (real-time clock), and the requirements of RTC for backup power supply are as follows:
[0037] Low leakage: ensure that the capacitor can keep the power for a long time after power failure;
[0038] Enough capacity: can support RTC to work for a long time after power failure;
[0039] Stable voltage output: RTC usually needs stable voltage to work normally.
[0040] Combined with the characteristics of farad capacitor, the scheme idea of the application is proposed, which will be described in detail as follows:
[0041] The output end of the main power supply is connected to the input end of the isolation module, the output end of the isolation module is connected to the first end of the signal processing module, the second end of the signal processing module is connected to the first end of the backup power supply module, and the second end of the backup power supply module is grounded, for charging the farad capacitor in the backup power supply module by the main power supply.
[0042] Specifically, when the main power supply is powered, the electric signal passes through the isolation module, and the farad capacitor in the backup power supply module is charged through the signal processing module. In this case, the main power supply is used to power the real-time clock module, and for the farad capacitor, a charging circuit is formed (powered by the main power supply, charged to the backup power supply module after passing through the isolation module and the signal processing module).
[0043] Wherein, the isolation module can include a diode, for preventing the electric signal from being discharged to the main power supply during the charging process and subsequent discharge of the capacitor when the backup power supply is enabled, so as to ensure the correct direction of current.
[0044] The signal processing module can include one or more current limiting resistors, which are used to limit the current flowing through the circuit to prevent overcurrent damage to the capacitor or real-time clock and other circuit components.
[0045] Further, the backup power module is also connected to the input end of the backup power module through the signal processing module, so as to provide the working voltage required by the real-time clock module by taking the farad capacitor as a backup power supply.
[0046] Specifically, the farad capacitor in the backup power module supplies power to the real-time clock module through the current limiting resistor in the signal processing module, forming a discharge circuit of the farad capacitor (discharged by the backup power module and supplied to the real-time clock module after passing through the signal processing module).
[0047] Further, with reference to Figure 2 , Figure 2 is a circuit schematic diagram of a backup power supply circuit of a real-time clock provided by the embodiment of the present application, which provides a specific circuit structure schematic diagram of the main power supply, isolation module, signal processing module, backup power module and real-time clock module proposed in the present application, which will be described in detail as follows:
[0048] Regarding the main power supply: in the embodiment of the present application, the voltage output of the main power supply is 5V or 3.3V.
[0049] Regarding the isolation module: in the embodiment of the present application, a diode is arranged in the isolation module, the anode of the diode is connected to the output end of the main power supply, and the cathode of the diode is connected to the output end of the signal processing module and the real-time clock module. Based on this connection mode, the unidirectional conduction of the diode is used to prevent the current from being transmitted to the main power supply when the farad capacitor discharges to supply power to the real-time clock module.
[0050] Specifically, in the embodiment of the present application, the diode D1 used can be a Schottky diode. Compared with ordinary diodes, Schottky diodes have lower forward conduction voltage drop, shorter reverse recovery time, faster switching speed (can quickly respond and switch in high-frequency applications), and are more suitable for circuits in this scenario.
[0051] More specifically, in the embodiment of the present application, the model of the Schottky diode used can be SS14.
[0052] Regarding the signal processing module: the signal processing module includes a current limiting unit and a filtering unit, wherein the current limiting unit includes one or more current limiting resistors R1, and the filtering unit includes one or more filtering capacitors C1.
[0053] One end of the current-limiting resistor is connected to the negative electrode of the diode and one end of the filter capacitor respectively, and the other end of the filter capacitor is grounded.
[0054] The other end of the current-limiting resistor is connected to the first end of the farad capacitor, and the second end of the farad capacitor is grounded.
[0055] The connection between the current-limiting resistor and the diode is also connected to the input end of the real-time clock module.
[0056] Specifically, the current-limiting resistor can limit the current flowing through it, preventing excessive current from damaging the farad capacitor, real-time clock module and other components, thereby improving circuit reliability. The filter capacitor is grounded to form a loop and improve signal stability.
[0057] More specifically, in the embodiment of the present application, the resistance value of the current-limiting resistor is 1kΩ, the farad capacitor C2 is a 10F farad capacitor, and the charging current is 10mA. The charging time is 1 hour, and the charging time calculation formula is:
[0058]
[0059] wherein, represents the charging time, and the unit is second; represents the capacitance value, and the unit is farad, F; represents the final charging voltage, and the unit is volt, V; represents the initial charging voltage, and the unit is volt, V; represents the charging current, and the unit is ampere, A.
[0060] When the main power supply stops supplying power, taking the 10F farad capacitor provided in the embodiment of the present application as an example, the initial voltage is 3.3V, the minimum working voltage is 1.3V, the RTC power consumption is 1μA, and the backup time is about:
[0061]
[0062] wherein, is the initial voltage, is the minimum working voltage, is the RTC power consumption.
[0063] In a second aspect, the present application provides an electronic device loaded with the above-mentioned backup power supply circuit of the real-time clock.
[0064] The above describes the preferred embodiments of the present application, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.
Claims
1. A backup power supply circuit for a real-time clock, characterized by The application relates to a backup power supply circuit for a real-time clock. The backup power supply circuit comprises a main power supply, an isolation module, a signal processing module, a backup power supply module and a real-time clock module. The backup power supply module comprises a farad capacitor. An output end of the main power supply is connected with an input end of the isolation module, an output end of the isolation module is connected with a first end of the signal processing module, a second end of the signal processing module is connected with a first end of the backup power supply module, and a second end of the backup power supply module is grounded, so that the farad capacitor in the backup power supply module is charged by the main power supply. The backup power supply module is also connected with an input end of the backup power supply module through the signal processing module, so that the farad capacitor is used as a backup power supply to provide working voltage required by the real-time clock module.
2. The backup power supply circuit for a real-time clock according to claim 1, wherein, The farad capacitor is a 10F farad capacitor.
3. The backup power supply circuit for a real-time clock according to claim 1, wherein, The isolation module comprises a diode. A positive electrode of the diode is connected with an output end of the main power supply, and a negative electrode of the diode is connected with an output end of the signal processing module and the real-time clock module.
4. The backup power supply circuit for a real-time clock according to claim 3, wherein The diode is a Schottky diode.
5. The backup power supply circuit for a real-time clock according to claim 4, wherein The Schottky diode adopts a model of SS14.
6. The backup power supply circuit for a real-time clock according to claim 3, wherein The signal processing module comprises a current-limiting resistor and a filter capacitor. One end of the current-limiting resistor is connected with the negative electrode of the diode and one end of the filter capacitor, and the other end of the filter capacitor is grounded. The other end of the current-limiting resistor is connected with a first end of the farad capacitor, and a second end of the farad capacitor is grounded. The connection position of the current-limiting resistor and the diode is also connected with an input end of the real-time clock module.
7. The backup power supply circuit for a real-time clock according to claim 6, wherein The resistance value of the current-limiting resistor is 1kΩ.
8. The backup power supply circuit for a real-time clock according to claim 1, wherein The voltage output of the main power supply is 5V or 3.3V.
9. An electronic device, comprising: The backup power supply circuit is loaded with the real-time clock. The application relates to a backup power supply circuit for a real-time clock. The backup power supply circuit comprises a main power supply, an isolation module, a signal processing module, a backup power supply module and a real-time clock module. The backup power supply module comprises a farad capacitor. An output end of the main power supply is connected with an input end of the isolation module, an output end of the isolation module is connected with a first end of the signal processing module, a second end of the signal processing module is connected with a first end of the backup power supply module, and a second end of the backup power supply module is grounded, so that the farad capacitor in the backup power supply module is charged by the main power supply. The backup power supply module is also connected with an input end of the backup power supply module through the signal processing module, so that the farad capacitor is used as a backup power supply to provide working voltage required by the real-time clock module. The farad capacitor is a 10F farad capacitor. The isolation module comprises a diode. A positive electrode of the diode is connected with an output end of the main power supply, and a negative electrode of the diode is connected with an output end of the signal processing module and the real-time clock module. The diode is a Schottky diode. The Schottky diode adopts a model of SS14. The signal processing module comprises a current-limiting resistor and a filter capacitor. One end of the current-limiting resistor is connected with the negative electrode of the diode and one end of the filter capacitor, and the other end of the filter capacitor is grounded. The other end of the current-limiting resistor is connected with a first end of the farad capacitor, and a second end of the farad capacitor is grounded. The connection position of the current-limiting resistor and the diode is also connected with an input end of the real-time clock module. The resistance value of the current-limiting resistor is 1kΩ. The voltage output of the main power supply is 5V or 3.3V. The backup power supply circuit is loaded with the real-time clock. The application relates to a backup power supply circuit for a real-time clock. The backup power supply circuit comprises a main power supply, an isolation module, a signal processing module, a backup power supply module and a real-time clock module. The backup power supply module comprises a farad capacitor. An output end of the main power supply is connected with an input end of the isolation module, an output end of the isolation module is connected with a first end