Power supply circuit and device of real-time clock

Abstract

The invention discloses a power supply circuit and device of a real-time clock, and relates to the technical field of circuits, the power supply circuit is applied to the real-time clock of a server, the power supply circuit comprises a transmitting module, a receiving module and a power supply management circuit, the receiving module can generate a corresponding induction current by using the alternating magnetic field so as to obtain a direct current capable of supplying power to the real-time clock, and then the power supply management circuit outputs a direct current power supply to the real-time clock according to the power supply requirement of the real-time clock; the energy is transmitted by utilizing the electromagnetic induction principle, so that the continuous power supply to the real-time clock is realized, the operation of replacing a battery is avoided, the operations of shutdown loss and the like are avoided, the maintenance cost of the whole server is reduced, the working continuity of the server is ensured, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a power supply circuit and device for a real-time clock. Background Art

[0002] At present, most servers are equipped with RTC (Real-Time Clock) modules. RTC usually has a battery inside to provide power. The RTC battery is mainly used to provide power to the real-time clock module when the server loses the main power supply to ensure the accuracy and continuity of time. In this way, even if the server is shut down or encounters a power outage, the time information can be saved, which is essential for maintaining the server system's logging, timestamp accuracy, scheduled tasks and other functions. However, the capacity of RTC batteries is relatively small. At the same time, due to environmental factors such as the temperature of the computer room and the attenuation of the battery itself, the power consumption of RTC batteries is too high, which often leads to the RTC battery being consumed before the server's life is over. Replacing RTC batteries requires the servers to be removed from the shelves in batches and powered off. During this process, the servers will be shut down, causing immeasurable losses to users. Therefore, the labor costs, downtime losses, and subsequent testing and verification involved in the entire battery replacement work will increase the overall maintenance cost; especially for critical business servers that need to run 24 / 7, even a short downtime may affect service continuity and user experience.

[0003] It can be seen that how to ensure continuous power supply of the RTC module is a problem that needs to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a power supply circuit and device for a real-time clock, which can solve the problem of how to ensure continuous power supply of an RTC module.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a power supply circuit of a real-time clock, which is applied to a real-time clock of a server; the power supply circuit includes:

[0006] A transmitting module, the input end of which is connected to a power supply, and is used to form an alternating magnetic field based on the power supply;

[0007] A receiving module, configured to generate an induced current based on the alternating magnetic field formed by the transmitting module, and convert the induced current into a direct current;

[0008] A power management circuit, whose input end is connected to the output end of the receiving module and whose output end is connected to the power supply end of the real-time clock, is used to output the received DC current to the power supply end of the real-time clock and adjust the current output to the power supply end of the real-time clock according to the power supply requirement of the real-time clock.

[0009] In some embodiments, the receiving module includes:

[0010] an energy receiving circuit, arranged in the alternating magnetic field formed by the transmitting module, and used for generating an induced current based on the alternating magnetic field formed by the transmitting module;

[0011] A rectifier circuit, whose input end is connected to the output end of the energy receiving circuit, and is used to convert the induced current into a direct current;

[0012] A filter circuit, whose input end is connected to the output end of the rectifier circuit and whose output end is connected to the input end of the power management circuit, is used for filtering the direct current.

[0013] In some embodiments, the rectifier circuit comprises:

[0014] a first diode;

[0015] a second diode, a cathode of which is respectively connected to the cathode of the first diode and the first output end of the energy receiving circuit;

[0016] a third diode, a cathode of which is respectively connected to the anode of the second diode and the first input terminal of the filter circuit;

[0017] A fourth diode, an anode of which is respectively connected to the anode of the third diode and the second output end of the energy receiving circuit, and a cathode of which is respectively connected to the anode of the first diode and the second input end of the filter circuit.

[0018] In some embodiments, the rectifier circuit further includes:

[0019] An inductor, wherein a first end is respectively connected to the anode of the first diode and the cathode of the fourth diode, and a second end is connected to the second input end of the filter circuit.

[0020] In some embodiments, it also includes:

[0021] A voltage stabilizing device, the input end of which is respectively connected to the anode of the first diode and the cathode of the fourth diode, and the output end of which is connected to the first end of the inductor;

[0022] and / or,

[0023] A fifth diode has a cathode connected to the output end of the voltage stabilizing device and the first end of the inductor respectively, and an anode connected to the anode of the second diode, the cathode of the third diode and the first input end of the filter circuit respectively.

[0024] In some embodiments, the filtering circuit comprises:

[0025] A first filter capacitor, a first end of which is respectively connected to the first output end of the rectifier circuit and the input end of the power management circuit, and a second end of which is connected to the second output end of the rectifier circuit;

[0026] and / or,

[0027] The second filter capacitor has a first end connected to the first output end of the rectifier circuit and the input end of the power management circuit respectively, and a second end connected to the second output end of the rectifier circuit.

[0028] In some embodiments, the energy receiving circuit includes:

[0029] A secondary coil is arranged in the alternating magnetic field formed by the transmitting module;

[0030] a first capacitor;

[0031] a second capacitor, a first end of which is respectively connected to the first end of the secondary coil, the first end of the first capacitor and the first input end of the rectifier circuit, and a second end of which is respectively connected to the second end of the secondary coil, the second end of the first capacitor and the second input end of the rectifier circuit;

[0032] The transmitting module comprises:

[0033] A primary coil, a first end of which is connected to a power supply;

[0034] The third capacitor;

[0035] a fourth capacitor, a first end of which is respectively connected to the first end of the primary coil and the first end of the third capacitor;

[0036] A first controllable switch, a first end of which is respectively connected to the second end of the primary coil, the second end of the third capacitor and the second end of the fourth capacitor, and a second end of which is grounded;

[0037] A frequency control circuit, whose output end is connected to the control end of the first controllable switch, is used to control the first controllable switch to be turned on and off at a preset frequency.

[0038] In some embodiments, the frequency control circuit comprises:

[0039] A timer, whose input end is connected to the power supply and is used to generate a pulse signal of a preset frequency;

[0040] A first resistor, a first end of which is connected to the power supply;

[0041] A second controllable switch, wherein the first end is respectively connected to the second end of the first resistor and the control end of the first controllable switch, and the second end is grounded. A controller is connected to the output end of the timer and is used to turn on and off at a preset frequency based on the pulse signal to control the first controllable switch to turn on and off at a preset frequency.

[0042] In some embodiments, the frequency control circuit further includes:

[0043] a second resistor, a first end of which is connected to the output end of the timer, and a second end of which is connected to the control end of the second controllable switch;

[0044] and / or,

[0045] A unidirectional conduction module has a first end connected to the power supply and a second end connected to the first end of the first resistor.

[0046] To solve the above technical problems, an embodiment of the present invention further provides a power supply device for a real-time clock, comprising a rechargeable battery and a power supply circuit for the real-time clock as described above, wherein the output end of the power supply circuit of the real-time clock is connected to the rechargeable battery, and the rechargeable battery is used to power the real-time clock.

[0047] It can be seen from the above technical solution that the transmitting module will use the power supply connected to itself to form an alternating magnetic field, so that the receiving module can use the alternating magnetic field to generate a corresponding induced current, and then obtain a DC current that can power the real-time clock, and then the power management circuit outputs the DC power to the real-time clock according to the power supply requirements of the real-time clock; the beneficial effect of the present invention is to use the principle of electromagnetic induction to transmit energy, so as to achieve continuous power supply to the real-time clock, thereby avoiding the operation of replacing batteries, avoiding downtime losses and other operations, reducing the maintenance cost of the entire server, ensuring the continuity of the server's work, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A schematic diagram of the structure of a power supply circuit of a real-time clock provided by an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of the structure of another power supply circuit of a real-time clock provided by an embodiment of the present invention;

[0051] Figure 3A schematic diagram of the structure of a receiving module provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the structure of a transmitting module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] The terms "including" and "having" in the specification of the present invention and the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0055] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] Next, a power supply circuit of a real-time clock provided by an embodiment of the present invention is described in detail, which is applied to a real-time clock of a server. Figure 1 As shown, Figure 1 A schematic diagram of a power supply circuit of a real-time clock provided by an embodiment of the present invention, wherein the power supply circuit of the real-time clock comprises:

[0057] The transmitting module 1 has an input end connected to the power supply VR and is used to form an alternating magnetic field based on the power supply VR;

[0058] The receiving module 2 is used to generate an induced current based on the alternating magnetic field formed by the transmitting module 1, and convert the induced current into a direct current;

[0059] The power management circuit 3 has an input end connected to the output end of the receiving module 2 and an output end connected to the power supply end of the real-time clock, and is used to output the received DC current to the power supply end of the real-time clock and adjust the current output to the power supply end of the real-time clock according to the power supply requirement of the real-time clock.

[0060] It is understandable that in order to realize continuous power supply to the real-time clock in the server, the present invention provides a power supply circuit for the real-time clock, which uses wireless charging to continuously power the real-time clock. In particular, when the RTC battery is exhausted, the power supply circuit provided by the present invention can be used to charge the RTC battery so that the charged RTC battery can continue to power the real-time clock, thereby avoiding the operation of replacing the battery. The entire power supply circuit includes a transmitting module 1, a receiving module 2 and a power management circuit 3. The transmitting module 1 and the receiving module 2 cooperate to generate an induced current using an alternating magnetic field. The transmitting end of the power supply circuit includes a primary coil L1. When there is a current passing through this coil, an alternating magnetic field is formed, and the intensity and direction of this alternating magnetic field vary with the frequency and phase of the current. At the same time, a secondary coil L2 is set near the RTC battery on the server motherboard as a receiving end. When this secondary coil L2 is placed in the alternating magnetic field generated by the transmitting end, according to the principle of electromagnetic induction, an induced current will be generated in the secondary coil L2. The induced current is subjected to rectification, voltage stabilization and other processes for energy conversion, and can be converted into direct current to be directly used to charge the battery or supply the circuit of the device.

[0061] Specifically, the charging of the power supply circuit utilizes the interaction between the primary coil L1 in the transmitting module 1 connected to the power supply VR and the secondary coil L2 in the receiving module 2 connected to the RTC battery to transmit energy. When the alternating current passes through the primary coil L1, a changing magnetic field is generated, which generates an electromotive force in the secondary coil L2, thereby generating a current, converting the received energy into electrical energy, and charging the device battery. When high-frequency alternating current passes through the primary coil L1 of the transmitting end, a rapidly changing alternating magnetic field is generated. The intensity and direction of this alternating magnetic field change with the frequency and amplitude of the current flowing through the primary coil L1. The changing magnetic field propagates from the transmitting end to the receiving end through the air or other non-magnetic materials (such as plastic shells). When the changing magnetic field passes through the secondary coil L2 of the receiving end, an induced current is generated in the secondary coil L2 according to the principle of electromagnetic induction. The induced current is converted into a direct current after processing, and the converted direct current is input into the power management circuit 3, which adjusts the size of the charging current according to the real-time status of the battery and the power demand. When the battery is full or the charging reaches the preset conditions, the charging process stops.

[0062] It is not difficult to understand that the power supply circuit can supply power to the real-time clock by directly outputting direct current to the real-time clock body. In order to improve the safety and reliability of the continuous power supply process, the preferred embodiment is to retain the battery setting of the real-time clock and charge the battery of the real-time clock to realize the continuous power supply to the real-time clock. At the same time, in conjunction with the control of the charging process by the power management circuit 3, the residual amount in the RTC battery can be guaranteed, thereby ensuring the continuous operation of the real-time clock. The power management circuit 3 is mainly used to adjust the size of the charging current output to the power supply end of the real-time clock. When the power supply end of the real-time clock is the charging end of the RTC battery, the charging speed can be adjusted according to the battery state. The battery state includes battery temperature, battery voltage, and battery charge and discharge state. The charging speed is adjusted by adjusting the size of the charging current to prevent overcharging and overheating during the battery charging process. The power management circuit 3 can be directly reused by the BMS (BATTERY MANAGEMENT SYSTEM, battery management system) of the RTC battery, or it can be implemented in other ways. The specific implementation method of the power management circuit 3 and its charging strategy are not particularly limited in this application.

[0063] Furthermore, when adjusting the charging current, the power management circuit 3 can be based on the charging curve of the battery, and will ensure that the battery charging curve is optimal as the goal of the adjustment strategy to maximize the charging efficiency. As a specific embodiment, when starting to charge, the constant current charging method can be used to charge the RTC battery with the maximum safe current to improve the charging efficiency, until the battery voltage reaches the preset threshold, and then the constant voltage charging method is used to charge the RTC battery with a constant preset voltage until the charging current is reduced to a very small value, and this process is repeated. At the same time, during the charging process, the battery voltage, charging current and battery temperature are detected in real time to determine whether the charging method needs to be adjusted. For example, after the battery voltage reaches the preset threshold, it is adjusted to constant voltage charging, and after the charging current is less than the current minimum threshold, it is adjusted to constant current charging; considering the power capacity of the RTC, when the battery is extremely undervoltage or the battery is nearly full, a low current slow charge is performed to prevent overcharging from causing abnormalities in the RTC battery; when the battery temperature is too high, a low current is used for charging to avoid safety problems caused by overheating.

[0064] It is understandable that there are many ways to determine whether charging needs to be terminated. Generally, the full charge of the RTC battery can be used as a sign of the end of charging. If you want to save energy further, you can calculate the battery life in real time based on the current battery capacity to ensure that the life can meet the server's working requirements. For example, if the server only needs to work for n hours due to its own life or application requirements, then charging can be stopped as long as the real-time calculated battery life is not less than n hours. The battery life refers to the length of time that the RTC can maintain normal operation.

[0065] It is not difficult to understand that the power supply circuit provided by the present invention exists independently of the server, and the RTC battery can be charged and the RTC can be powered on regardless of whether the server is in a powered-on state or in a working state. When the server is powered on, the server can also detect whether the RTC battery is abnormal. When the remaining amount of the RTC battery is lower than a preset value, the server can execute a corresponding prompt strategy to instruct the operator to charge the RTC battery through the power supply circuit, an external device. The specific types and implementation methods of the transmitting module 1, the receiving module 2, and the power supply VR are not particularly limited in this application. The power supply VR only needs to provide current to the transmitting module 1 to generate an alternating magnetic field. It is not limited to the high-frequency alternating current described above, and can be implemented by a power adapter or the like.

[0066] The present invention provides a power supply circuit for a real-time clock, which transmits energy in a wireless charging manner based on the principle of electromagnetic induction, allows power to be transmitted from the power supply circuit to the real-time clock through the air without using a physical connection, realizes the charging process of the real-time clock battery in the server, and can charge the electronic device without physical contact. Through this charging process, it can be ensured that the RTC is always powered, and the real-time clock is continuously powered, so that it does not need to be removed from the shelf to replace the battery due to lack of power, saving labor costs and improving work efficiency. The RTC battery is wirelessly charged by a small current wireless charging method, avoiding various cost consumption caused by the removal of the server. This charging method does not require physical connection, and the user does not need to frequently plug and unplug the charging cable. Since there is no physical connection, charging failure or equipment damage caused by poor contact can be avoided; wireless charging reduces the risk of direct contact power transmission, reduces the possibility of electric shock, and avoids the risk of electric shock; long-distance charging and efficient energy transmission can be achieved, improving the convenience and flexibility of the entire power supply circuit, and reducing energy loss.

[0067] See also Figure 2 As shown, Figure 2 A schematic diagram of the structure of another power supply circuit of a real-time clock provided by an embodiment of the present invention; in some embodiments, the receiving module 2 includes:

[0068] An energy receiving circuit is arranged in the alternating magnetic field formed by the transmitting module 1, and is used to generate an induced current based on the alternating magnetic field formed by the transmitting module 1;

[0069] A rectifier circuit 11, whose input end is connected to the output end of the energy receiving circuit, is used to convert the induced current into a direct current;

[0070] The filter circuit 12 has an input end connected to the output end of the rectifier circuit 11 and an output end connected to the input end of the power management circuit 3, and is used to filter the DC current.

[0071] It is understandable that when charging is required, the energy receiving circuit is set in the alternating magnetic field formed by the transmitting module 1. This alternating magnetic field will induce current in the energy receiving circuit, and this induced current will generally be alternating current. The real-time clock is a device that requires a DC power supply, so the power supply circuit ultimately needs to output DC power to charge the battery of the real-time clock. Therefore, a rectifier circuit 11 is also required in the receiving module 2 to convert the induced current into pulsating DC power. At the same time, in order to minimize the AC component in the pulsating DC voltage and retain its DC component, a filter circuit 12 can be further set to convert the pulsating DC power into smooth DC power. So that the power management circuit 3 can receive smooth DC power to charge the battery of the real-time clock. The specific types and implementation methods of the energy receiving circuit, the rectifier circuit 11 and the filter circuit 12 are not particularly limited in this application.

[0072] Specifically, the receiving module 2 not only needs to utilize the alternating magnetic field to generate the corresponding induced current, but also needs to further process the induced current through the rectifier circuit 11 and the filter circuit 12. Only then can the processed direct current realize effective and continuous power supply to the real-time clock under the control of the power management circuit 3, thereby ensuring the effective implementation of the charging process.

[0073] See also Figure 3 As shown, Figure 3 A schematic diagram of the structure of a receiving module provided in an embodiment of the present invention; in some embodiments, the rectifier circuit 11 includes:

[0074] A first diode D1;

[0075] A second diode D2, a cathode of which is respectively connected to the cathode of the first diode D1 and the first output end of the energy receiving circuit;

[0076] A third diode D3, a cathode of which is connected to the anode of the second diode D2 and the first input terminal of the filter circuit 12 respectively;

[0077] The fourth diode D4 has an anode connected to the anode of the third diode D3 and the second output end of the energy receiving circuit, and a cathode connected to the anode of the first diode D1 and the second input end of the filter circuit 12.

[0078] It is not difficult to understand that the rectifier circuit 11 in the receiving module 2 can be implemented by a rectifier bridge composed of diodes. The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are connected to each other to form a bridge rectifier structure. The input induced current is converted into a unidirectional DC signal by means of a rectifier bridge. At the same time, the rectifier can also play a role in protecting the circuit, using the unidirectional conduction characteristics of the diode to limit the magnitude and direction of the current, and prevent excessive voltage or excessive current from damaging the power management circuit 3 and the real-time clock. The specific types and implementation methods of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are not particularly limited in this application.

[0079] Specifically, the rectifier circuit 11 can be implemented by a rectifier bridge formed by connecting four diodes in a bridge-like manner. The conduction and cutoff characteristics of the diodes can be used to achieve unidirectional DC output, and the circuit can be further protected to improve the stability and reliability of the entire power supply circuit. The circuit structure is simple and easy to implement. The components used are low-cost and small in size, which is conducive to the simple implementation of the entire power supply circuit.

[0080] In some embodiments, the rectifier circuit 11 further includes:

[0081] The inductor L0 has a first end connected to the anode of the first diode D1 and the cathode of the fourth diode D4 respectively, and a second end connected to the second input end of the filter circuit 12 .

[0082] It is understandable that a series inductor L0 may be further added to the rectifier circuit 11. Since the impedance of the inductor L0 to DC is small and the impedance to AC is large, the series inductor L0 can play a certain filtering role, smooth the current, and avoid excessive DC loss, so that the current waveform output by the rectifier circuit 11 is smoother. The specific type and implementation of the inductor L0 are not particularly limited in this application.

[0083] Specifically, a series inductor L0 may be further added to the rectifier circuit 11 to smooth the current, thereby improving the stability and reliability of the DC current ultimately output to the power management circuit 3 . The structure is simple and easy to implement.

[0084] In some embodiments, it also includes:

[0085] A voltage stabilizing device, the input end of which is respectively connected to the anode of the first diode D1 and the cathode of the fourth diode D4, and the output end of which is connected to the first end of the inductor L0;

[0086] and / or,

[0087] The fifth diode D5 has a cathode connected to the output end of the voltage stabilizing device and the first end of the inductor L0 , and an anode connected to the anode of the second diode D2 , the cathode of the third diode D3 , and the first input end of the filter circuit 12 .

[0088] It is not difficult to understand that a voltage stabilizer and / or a fifth diode D5 may be further provided at the output end of the rectifier circuit 11. The voltage stabilizer can stabilize the DC voltage output by the rectifier circuit 11 at a certain value, thereby maintaining the constant output DC current. At the same time, the voltage stabilizer can also be used to adjust the output voltage of the rectifier circuit 11 to a suitable level required for battery charging, thereby ensuring safe charging and stable charging of the real-time clock. The fifth diode D5 is reversely connected in parallel between the two output ends of the rectifier circuit 11, and uses its reverse breakdown voltage to clamp the DC power output by the rectifier circuit 11, thereby clamping the DC voltage between the two output ends of the rectifier circuit 11 to a suitable value; it can also play a role in electrostatic protection, further protecting the circuit. The specific type and implementation method of the voltage stabilizer and the fifth diode D5 are not particularly limited in this application. For example, Figure 3 As shown, the voltage stabilizing device can be implemented using a voltage stabilizing IC (Integrated Circuit).

[0089] Specifically, by further adding a voltage stabilizing device and / or a fifth diode D5 in the receiving module 2, the DC voltage and the corresponding DC current output by the rectifier circuit 11 can be further adjusted to remain within a safe range, thereby ensuring that the power management circuit 3 can receive a DC voltage within a safe range, thereby achieving safe charging of the real-time clock and further protecting the circuit.

[0090] In some embodiments, the filter circuit 12 includes:

[0091] A first filter capacitor C11, a first end of which is respectively connected to the first output end of the rectifier circuit 11 and the input end of the power management circuit 3, and a second end of which is connected to the second output end of the rectifier circuit 11;

[0092] and / or,

[0093] The second filter capacitor C12 has a first end connected to the first output end of the rectifier circuit 11 and the input end of the power management circuit 3 , and a second end connected to the second output end of the rectifier circuit 11 .

[0094] It is understandable that the filter circuit 12 can be implemented by a first filter capacitor C11 and / or a second filter capacitor C12 connected in parallel between the two output terminals of the rectifier circuit 11. The DC power output by the rectifier circuit 11 is converted into a smoother DC power by capacitor filtering. When the high-frequency noise signal in the circuit passes through the filter circuit 12, it will be absorbed and stored by the capacitor. At the same time, two parallel filter capacitors are set in the filter circuit 12 to increase the capacitance of the capacitor in the filter circuit 12 and improve the filtering effect. The specific type and implementation method of the first filter capacitor C11 and the second filter capacitor C12 are not particularly limited in this application.

[0095] Specifically, the filtering circuit 12 can be implemented by means of parallel capacitors, which has good filtering effect and can effectively improve the accuracy and stability of the DC power finally output to the power management circuit 3. In addition, the circuit structure is simple and easy to implement. The components used are low-cost and small in size, which is conducive to the simple implementation of the entire power supply circuit.

[0096] See also Figure 4 As shown, Figure 4 A schematic diagram of the structure of a transmitting module provided in an embodiment of the present invention. In some embodiments, the energy receiving circuit includes:

[0097] The secondary coil L2 is arranged in the alternating magnetic field formed by the transmitting module 1;

[0098] A first capacitor C1;

[0099] A second capacitor C2, a first end of which is respectively connected to the first end of the secondary coil L2, the first end of the first capacitor C1 and the first input end of the rectifier circuit 11, and a second end of which is respectively connected to the second end of the secondary coil L2, the second end of the first capacitor C1 and the second input end of the rectifier circuit 11;

[0100] The transmitting module 1 comprises:

[0101] The primary coil L1, a first end of which is connected to the power supply VR;

[0102] A third capacitor C3;

[0103] A fourth capacitor C4, a first end of which is respectively connected to the first end of the primary coil L1 and the first end of the third capacitor C3;

[0104] A first controllable switch Q1, a first end of which is respectively connected to the second end of the primary coil L1, the second end of the third capacitor C3 and the second end of the fourth capacitor C4, and a second end of which is grounded;

[0105] The frequency control circuit has an output end connected to the control end of the first controllable switch Q1 and is used to control the first controllable switch Q1 to be turned on and off at a preset frequency.

[0106] It is not difficult to understand that the transmitting module 1 and the receiving module 2 can utilize the strong coupling between two coils tuned to the same resonant frequency to transmit energy. The coil at the transmitting end generates a magnetic field under the action of the excitation current, and this magnetic field resonates with the magnetic field of the receiving end coil, thereby realizing energy transmission. Therefore, in the receiving module 2, the secondary coil L2 needs to work with the first capacitor C1 and the second capacitor C2 to form an LC resonant circuit. In the transmitting module 1, the primary coil L1 needs to work with the third capacitor C3 and the fourth capacitor C4 to form an LC resonant circuit, thereby ensuring that both the primary coil L1 and the secondary coil L2 can operate at a specific resonant frequency. In this embodiment, a resonant circuit is formed by connecting the coil in parallel with the capacitor. When the circuit resonates, the current in the coil reaches a maximum, thereby generating a strong magnetic field. This resonant state allows energy to be coupled through near-field evanescent waves within the wavelength range, so that most of the energy is transferred from the transmitting module 1 to the receiving module 2. A resonant circuit can also be formed by connecting the coil in series with the capacitor. The working principle is similar, and this application will not be repeated here.

[0107] It should be noted that if Figure 4 As shown, the resonant frequency of the resonant circuit in the transmitting module 1 is , where L1 represents the inductance of the primary coil L1, C3 represents the capacitance of the third capacitor C3, and C4 represents the capacitance of the third capacitor C3. The third capacitor C3 and the fourth capacitor C4 are variable capacitors. By changing the capacitance of the third capacitor C3 and the fourth capacitor C4 in the LC parallel resonant circuit, the oscillation frequency can be adjusted to ensure the optimal charging efficiency. The frequency stability of the oscillation depends on the quality factor (Q value) of the LC circuit and the overall design of the circuit. A high-quality LC circuit can provide better frequency stability. Figure 3 As shown, the secondary coil L2, the first capacitor C1 and the second capacitor C2 constitute an energy receiving circuit, and its resonant frequency is F2= , where L2 represents the inductance of the secondary coil L2, C1 represents the capacitance of the first capacitor C1, and C2 represents the capacitance of the second capacitor C2. By ensuring that the resonant frequencies of F1 and F2 are consistent during the recharging process, the power transmission can be maximized and excessive energy loss can be avoided.

[0108] It is understandable that, considering that the transmitting module 1 needs to adjust the frequency of the resonant circuit where the primary coil L1 is located to ensure efficient energy transmission, a frequency control module and a first controllable switch Q1 need to be provided in the transmitting module 1 to adjust the current flowing through the primary coil L1. The frequency control switch controls the first controllable switch Q1 to quickly turn on and off according to a preset frequency, thereby providing a high-frequency current to the primary coil L1 so that the primary coil L1 generates an oscillating magnetic field. At the same time, the preset frequency can be adjusted, that is, the switching frequency of the first controllable switch Q1 can be adjusted to control the operating frequency of the resonant circuit where the primary coil L1 is located, thereby controlling the resonant frequency of the transmitting module 1 to match that of the receiving module 2 to achieve optimal energy transmission efficiency; the power transmitted to the receiving module 2 can also be controlled by adjusting the on-time ratio (duty cycle) of the first controllable switch Q1 to avoid overcharging or undercharging.

[0109] It is not difficult to understand that the primary coil L1 and the secondary coil L2 in the power supply circuit are the core components of energy conversion. The power supply VR can provide a stable DC input for the transmitting module 1, and use the primary coil L1 to convert it into an alternating current. The frequency control circuit is responsible for adjusting the current and frequency of the transmitting module 1, as well as the communication with the receiving end, to ensure safe and efficient energy transmission. Finally, the induced current generated by the secondary coil L2 is then converted into a stable voltage source through the rectifier circuit 11, the voltage regulator IC and other circuits in turn, and the induced current is converted into a DC suitable for battery charging, which is provided to the RTC for power supply. The specific types and implementation methods of the secondary coil L2, the first capacitor C1, the second capacitor C2, the primary coil L1, the third capacitor C3, the fourth capacitor C4, the first controllable switch Q1 and the frequency control circuit are not particularly limited in this application. The first controllable switch Q1 can be implemented by a switching device such as a MOS tube (Metal-Oxide-Semiconductor Field-EffectTransistor).

[0110] Furthermore, when the server is powered on, the real-time clock can be further protected in cooperation with the server. For example, the power supply voltage input to the RTC can be sent to the server's BMC (Baseboard Management Controller) through ADC acquisition, so that the BMC can access and determine the working voltage and temperature of the RTC; at the same time, the temperature detection device TEMP is placed near the RTC, and the BMC accesses the actual temperature of the RTC detected by the temperature detection device through I2C. The BMC can perform overvoltage protection, undervoltage protection, and overtemperature protection on the RTC according to the detected voltage and temperature. A communication connection can also be established between the RTC and the server's CPU (Central Processing Unit). When the server is powered on, the CPU detects the battery status of the RTC battery, such as the remaining amount, battery voltage, and battery temperature, in real time, and executes a corresponding prompt strategy. For example, a one-to-one corresponding prompt strategy can be set for the abnormal conditions of battery overtemperature, overvoltage, undervoltage, and insufficient battery remaining amount. When the CPU detects that the RTC battery has a certain abnormal condition, the corresponding prompt strategy is executed to prompt the operator to start charging or cooling and other protection operations. At the same time, an over-temperature protection circuit can be set for the RTC battery, and a communication connection can be established between the CPU, the power management circuit 3 and the timer. When the RTC battery is over-temperature, the server directly controls the over-temperature protection circuit to start the over-temperature protection; when the RTC battery is over-voltage or under-voltage, the server informs the power management circuit 3 of the specific voltage condition of the RTC battery, and the power management circuit 3 adjusts the charging current of the RTC battery according to the voltage condition; when the RTC battery has insufficient remaining power, the server informs the power management circuit 3 and the timer so that the timer starts to generate high-frequency current, thereby starting the charging process of the RTC battery. The power management circuit 3 can also determine when to end charging based on the specific remaining power.

[0111] Specifically, the transmitting module 1 and the receiving module 2 can use a resonant circuit structure realized by the cooperation of a coil and a capacitor to realize energy transmission. The resonant circuit is realized by connecting the coil and the capacitor in parallel, which has higher flexibility. At the same time, the frequency control circuit set in the transmitting module 1 and the capacitance adjustment of the capacitor in the resonant circuit can adjust the resonant frequency of the resonant circuit and the current flowing through the primary coil L1, thereby realizing efficient energy transmission and ensuring the safety and reliability of the charging process.

[0112] In some embodiments, the frequency control circuit comprises:

[0113] A timer, the input end of which is connected to the power supply VR, and is used to generate a pulse signal of a preset frequency;

[0114] A first resistor R1, a first end of which is connected to a power supply VR;

[0115] The second controllable switch Q2 has a first end connected to the second end of the first resistor R1 and the control end of the first controllable switch Q1 respectively, and a second end connected to ground. The controller is connected to the output end of the timer and is used to turn on and off at a preset frequency based on the pulse signal to control the first controllable switch Q1 to turn on and off at the preset frequency.

[0116] It can be understood that the frequency control circuit can specifically use a timer to realize the control of the first controllable switch Q1. At the same time, in order to improve the accuracy and reliability of the control process of the first controllable switch Q1, a first resistor R1 and a second controllable switch Q2 can also be set in the frequency control circuit. The timer can generate a pulse signal of a preset fixed frequency. Under the action of this pulse signal, the second controllable switch Q2 is turned on and off at a preset frequency. When the second controllable switch Q2 is turned on, the control end of the first controllable switch Q1 is pulled down to the ground and is also turned on. When the second controllable switch Q2 is turned off, the control end of the first controllable switch Q1 is pulled up by the power supply VR and is also turned off. The combination of the two controllable switches is used to realize the generation of high-frequency current, which has higher stability and reliability. At the same time, the first resistor R1 is set at the control end of the second controllable switch Q2 to provide a bias operating point for the second controllable switch Q2 to ensure the accuracy and reliability of the operation process of the second controllable switch Q2. The present application does not specifically limit the specific types and implementations of the timer, the first resistor R1, and the second controllable switch Q2. The second controllable switch Q2 can be implemented in the form of a triode. Figure 4 As shown, a 555 timer can be used to generate pulses of a fixed frequency to control the transmitting module 1 to generate electromagnetic waves of a fixed frequency.

[0117] Specifically, a pulse signal of a preset frequency can be effectively generated through the timer. Based on this pulse signal and the second controllable switch Q2, the on and off of the first controllable switch Q1 can be accurately and effectively controlled to achieve the generation of high-frequency current. The entire circuit structure is simple and easy to implement. The components used are low-cost and small in size, which is conducive to the simple implementation of the entire power supply circuit.

[0118] In some embodiments, the frequency control circuit further comprises:

[0119] A second resistor R2, a first end of which is connected to the output end of the timer, and a second end of which is connected to the control end of the second controllable switch Q2;

[0120] and / or,

[0121] The unidirectional conducting module D0 has a first end connected to the power supply VR, and a second end connected to the first end of the first resistor R1.

[0122] It is not difficult to understand that in order to improve the safety and reliability of the first controllable switch Q1, a second resistor R2 and / or a unidirectional conduction module D0 connected in series may be added between the power supply VR and the control end of the first controllable switch Q1. The unidirectional conduction module D0 may specify the current direction output by the power supply VR to prevent circuit abnormalities caused by reverse connection of the power supply, and further protect the circuit; the first resistor R1 may play a role in current limiting to prevent excessive current from being output from the power supply VR to the control end of the first controllable switch Q1. The specific type and implementation of the second resistor R2 and the unidirectional conduction module D0 are not particularly limited in this application, and the unidirectional conduction module D0 may be implemented specifically by a diode.

[0123] Specifically, by further adding a second resistor R2 and / or a unidirectional conduction module D0 in series, it is possible to effectively prevent the control end of the first controllable switch Q1 from receiving a reverse or excessive current, thereby ensuring the safety and reliability of the first controllable switch Q1, and further realizing circuit protection for the transmitting module 1 and the entire power supply circuit. The structure is simple and easy to implement.

[0124] To solve the above technical problems, an embodiment of the present invention further provides a power supply device for a real-time clock, comprising a rechargeable battery and a power supply circuit for the real-time clock as described above, wherein the output end of the power supply circuit for the real-time clock is connected to the rechargeable battery, and the rechargeable battery is used to power the real-time clock.

[0125] It is understandable that when the power supply circuit of the real-time clock provided by the present invention is used to continuously power the real-time clock, a rechargeable battery needs to be used as a power source in the real-time clock, so that when the battery power is lower than a preset threshold, the power supply circuit of the real-time clock provided by the present invention is enabled to charge the battery. The specific type and implementation of the real-time clock and its rechargeable battery are not particularly limited in this application, and can be implemented by a button battery or the like.

[0126] For the description of the features in the embodiment corresponding to the power supply device of the real-time clock provided by the present invention, reference can be made to the relevant description of the embodiment corresponding to the power supply circuit of the real-time clock, which will not be described in detail here.

[0127] The above is a detailed introduction to a power supply circuit and device for a real-time clock provided by an embodiment of the present invention. In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0128] The above is a detailed introduction to a power supply circuit and device for a real-time clock provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A power supply circuit for a real-time clock, characterized in that: A real-time clock applied to a server; the power supply circuit comprises: A transmitting module, the input end of which is connected to a power supply, and is used to form an alternating magnetic field based on the power supply; A receiving module, configured to generate an induced current based on the alternating magnetic field formed by the transmitting module, and convert the induced current into a direct current; A power management circuit, whose input end is connected to the output end of the receiving module and whose output end is connected to the power supply end of the real-time clock, is used to output the received DC current to the power supply end of the real-time clock and adjust the current output to the power supply end of the real-time clock according to the power supply requirement of the real-time clock.

2. The power supply circuit of the real-time clock according to claim 1, characterized in that: The receiving module comprises: an energy receiving circuit, arranged in the alternating magnetic field formed by the transmitting module, and used for generating an induced current based on the alternating magnetic field formed by the transmitting module; A rectifier circuit, whose input end is connected to the output end of the energy receiving circuit, and is used to convert the induced current into a direct current; A filter circuit, whose input end is connected to the output end of the rectifier circuit and whose output end is connected to the input end of the power management circuit, is used for filtering the direct current.

3. The power supply circuit of the real-time clock as claimed in claim 2, characterized in that: The rectifier circuit comprises: A first diode; a second diode, a cathode of which is respectively connected to the cathode of the first diode and the first output end of the energy receiving circuit; a third diode, a cathode of which is respectively connected to the anode of the second diode and the first input terminal of the filter circuit; A fourth diode, an anode of which is respectively connected to the anode of the third diode and the second output end of the energy receiving circuit, and a cathode of which is respectively connected to the anode of the first diode and the second input end of the filter circuit.

4. The power supply circuit of the real-time clock as claimed in claim 3, characterized in that: The rectifier circuit also includes: An inductor, wherein a first end is respectively connected to the anode of the first diode and the cathode of the fourth diode, and a second end is connected to the second input end of the filter circuit.

5. The power supply circuit of the real-time clock as claimed in claim 4, characterized in that: Also includes: A voltage stabilizing device, the input end of which is respectively connected to the anode of the first diode and the cathode of the fourth diode, and the output end of which is connected to the first end of the inductor; and / or, A fifth diode has a cathode connected to the output end of the voltage stabilizing device and the first end of the inductor respectively, and an anode connected to the anode of the second diode, the cathode of the third diode and the first input end of the filter circuit respectively.

6. The power supply circuit of the real-time clock as claimed in claim 2, characterized in that: The filtering circuit comprises: A first filter capacitor, a first end of which is respectively connected to the first output end of the rectifier circuit and the input end of the power management circuit, and a second end of which is connected to the second output end of the rectifier circuit; and / or, The second filter capacitor has a first end connected to the first output end of the rectifier circuit and the input end of the power management circuit respectively, and a second end connected to the second output end of the rectifier circuit.

7. The power supply circuit of the real-time clock according to any one of claims 2 to 6, characterized in that: The energy receiving circuit comprises: A secondary coil is arranged in the alternating magnetic field formed by the transmitting module; a first capacitor; a second capacitor, a first end of which is respectively connected to the first end of the secondary coil, the first end of the first capacitor and the first input end of the rectifier circuit, and a second end of which is respectively connected to the second end of the secondary coil, the second end of the first capacitor and the second input end of the rectifier circuit; The transmitting module comprises: A primary coil, a first end of which is connected to a power supply; The third capacitor; a fourth capacitor, a first end of which is respectively connected to the first end of the primary coil and the first end of the third capacitor; A first controllable switch, a first end of which is respectively connected to the second end of the primary coil, the second end of the third capacitor and the second end of the fourth capacitor, and a second end of which is grounded; A frequency control circuit, whose output end is connected to the control end of the first controllable switch, is used to control the first controllable switch to be turned on and off at a preset frequency.

8. The power supply circuit of the real-time clock according to claim 7, characterized in that: The frequency control circuit comprises: A timer, whose input end is connected to the power supply and is used to generate a pulse signal of a preset frequency; A first resistor, a first end of which is connected to the power supply; A second controllable switch, wherein the first end is respectively connected to the second end of the first resistor and the control end of the first controllable switch, and the second end is grounded. A controller is connected to the output end of the timer and is used to turn on and off at a preset frequency based on the pulse signal to control the first controllable switch to turn on and off at a preset frequency.

9. The power supply circuit of the real-time clock as claimed in claim 8, characterized in that: The frequency control circuit also includes: a second resistor, a first end of which is connected to the output end of the timer, and a second end of which is connected to the control end of the second controllable switch; and / or, A unidirectional conduction module has a first end connected to the power supply and a second end connected to the first end of the first resistor.

10. A power supply device for a real-time clock, characterized in that: It comprises a rechargeable battery and a power supply circuit of a real-time clock as claimed in any one of claims 1 to 9, wherein an output end of the power supply circuit of the real-time clock is connected to the rechargeable battery, and the rechargeable battery is used to power the real-time clock.

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