Hybrid inverter real-time RTC clock power supply circuit

Abstract

The utility model provides a real-time RTC clock power supply circuit for a hybrid inverter. The real-time RTC clock power supply circuit comprises an inverter, a super capacitor, a battery, an MOS tube Q1, an MOS tube Q2 and an RTC clock, when the main power supply is normal, the inverter supplies power; when the main power supply is interrupted, the MOS tube Q2 is switched on, the MOS tube Q1 is switched off, and the super capacitor discharges; and when the super capacitor discharges to a set threshold value, the MOS tube Q2 is turned off, the MOS tube Q1 is turned on, and the battery is switched to continuously supply power. Composite energy storage of the battery and the super-capacitor is combined, the super-capacitor provides large instantaneous current in a short time, the burden of the battery is relieved, the consumption speed of the battery is reduced, the service life of the whole system is remarkably prolonged, and high environment adaptability is achieved. The stability and reliability of the system in various severe environments are effectively improved, the problem of shutdown or data loss of the system due to battery failure or power exhaustion is avoided, and the RTC can be ensured to continuously and stably work.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery power supply, and particularly relates to a real-time RTC clock power supply circuit of a hybrid inverter. BACKGROUND

[0002] With the wide application of intelligent power systems and hybrid inverters, the stability and reliability of the system are crucial to power equipment. Especially in the power management of the real-time clock (RTC) module, how to ensure that the RTC module can continue to operate normally in the case of main power disconnection or power interruption becomes a key problem. Currently, in the hybrid inverter, the power supply scheme of the RTC module mainly depends on the following two ways:

[0003] Single battery power supply (such as CR2032 button cell): CR2032 button cell is widely used in various low-power applications, including RTC module power supply. Although this scheme has a relatively simple design and relatively stable performance, it has the following limitations: first, the capacity of CR2032 battery is small, about 220mAh, which makes it limited in providing power, and cannot guarantee the long-term continuous operation of RTC in the scene of frequent power failure. Secondly, the performance of CR2032 battery is poor in low temperature environment, especially below-20℃ low temperature environment, which is prone to failure, which is a problem that cannot be ignored for some all-weather applications. Finally, due to the limited life of the battery, usually less than 5 years, the battery needs to be replaced regularly, which increases the maintenance cost and inconvenience.

[0004] Single super capacitor power supply: super capacitor (usually electrolytic capacitor) becomes a potential RTC power supply scheme due to its high charge and discharge rate. Super capacitor can be quickly charged and provide large current output, which makes it able to provide relatively stable power supply for RTC in the short term. However, super capacitor also has some disadvantages. The most significant problem is its high self-discharge rate, usually losing 5% to 10% of its power per month, so in the case of long-term power failure, super capacitor is difficult to maintain the work of RTC, which may lead to data loss of RTC. In addition, super capacitor needs to be frequently charged after power failure to keep enough power, which increases the requirement for system power management.

[0005] Although the above two traditional RTC power supply schemes have their own advantages, they also have obvious disadvantages, especially in the scene of frequent power failure or long-term unattended maintenance. These problems make the existing technology unable to meet some high-reliability and high-stability application scenarios. Therefore, a new RTC power supply scheme is needed to effectively overcome the problems of limited battery capacity, poor low-temperature performance and high self-discharge rate of super capacitor, so as to ensure that the RTC module can operate stably and reliably in various power failure or low temperature environment. CONTENT OF THE UTILITY MODEL

[0006] This application proposes a real-time RTC clock power supply circuit for a hybrid inverter, aiming to overcome the problems of poor power supply stability, poor low-temperature performance, and self-discharge in existing technologies. The circuit scheme employs a composite energy storage method combining coin cells and supercapacitors, and achieves stable power supply to the RTC module through an intelligent switching circuit.

[0007] Specifically, the hybrid inverter real-time RTC clock power supply circuit described in this application includes: an inverter, a supercapacitor, a battery, MOSFET Q1, MOSFET Q2, and an RTC clock; the inverter and the supercapacitor are connected in parallel and connected to the RTC clock; the RTC clock is also connected to the battery through MOSFET Q1; the battery is also connected to MOSFET Q2; wherein,

[0008] When the main power supply is normal, the inverter provides power.

[0009] When the main power supply is interrupted, MOSFET Q2 is turned on, and MOSFET Q1 is turned off, with the supercapacitor continuously supplying power to the RTC clock circuit. The supercapacitor has a fast response time and high energy density, enabling it to stabilize current output quickly and ensure a smooth system transition. As the supercapacitor discharges, its voltage gradually decreases. When the supercapacitor discharges to a set threshold, MOSFET Q2 is turned off, and MOSFET Q1 is turned on, switching to continuous battery power to maintain the RTC module's continuous operation and ensure no time data is lost.

[0010] Once the battery is connected to the system and begins to supply power, it will continue to provide a stable, low-power supply to the RTC module until the main power is restored or the battery reaches its limit.

[0011] This application optimizes the power switching process by intelligently switching MOSFETs and making reasonable use of the combination of inverters, supercapacitors, and batteries, thus ensuring the stability and reliability of power supply.

[0012] Preferably, the inverter is powered by an internal DC / DC converter; wherein, under normal operating conditions, the inverter obtains power through an internal DC / DC converter. The DC / DC converter converts the input DC power into a stable voltage suitable for the inverter's operation. By using a DC / DC converter, the inverter can manage power more efficiently, while improving the stability and reliability of the entire system.

[0013] One end of the inverter is also connected to diode D1, and the other end of diode D1 is connected to the RTC clock. The function of D1 is to ensure that the supercapacitor and battery only supply power to the RTC, prevent other circuits from consuming the RTC's power, ensure the directionality of the power supply, and prevent possible circuit damage.

[0014] The super capacitor is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to an RTC clock. The resistor R4 controls the discharging speed of the super capacitor, ensures smooth current supply, and prevents the instantaneous release of the electric energy of the capacitor, affecting the stability of the RTC clock module.

[0015] Further, when the main power supply is normal, the super capacitor is kept floating by the DC / DC (such as LDO_DC) inside the inverter and through D1 and R4.

[0016] The other end of the super capacitor is also connected to the gate of a MOS tube Q2;

[0017] The source of the MOS tube Q2 is connected to the negative pole of the battery;

[0018] The drain of the MOS tube Q2 is connected to the positive pole of the battery through a resistor R2.

[0019] The positive pole of the battery is connected to the drain of a MOS tube Q1;

[0020] The gate of the MOS tube Q1 is connected to the drain of the MOS tube Q2;

[0021] The source of the MOS tube Q1 is connected to the RTC clock.

[0022] In order to realize reverse current protection and ensure the normal operation of the circuit, a diode D3 is also connected between the source and the drain of the MOS tube Q1; wherein the diode D3 usually prevents reverse current flow when the circuit switches power supply or abnormally, protecting the MOS tube and other circuit elements.

[0023] A diode D2 is also connected between the drain of the MOS tube Q1 and the positive pole of the battery. The diode D2 prevents the LDO_DC from charging the button battery, causing damage to the battery.

[0024] A resistor R3 and a resistor R1 are also connected in series between the super capacitor and the gate of the MOS tube Q2. The resistor R1 is used to adjust the gate voltage of the MOS tube Q2, controlling its opening or closing characteristics.

[0025] The resistor R3 is also connected to a resistor R6;

[0026] The other end of the resistor R6 is connected to the RTC clock.

[0027] The resistors R3 and R6 are adjusted to set the set threshold of the discharging of the super capacitor.

[0028] The super capacitor and the battery can also supply power at the same time;

[0029] When the main power supply is restored, the inverter main power supply is switched back, and the super capacitor is charged.

[0030] Compared with the prior art, the application has the following beneficial effects:

[0031] The application combines the composite energy storage of the battery and the super capacitor. The super capacitor provides a larger instantaneous current in a short period, reduces the burden of the battery, thereby reducing the consumption speed of the battery, significantly prolonging the service life of the overall system, and the super capacitor can work in a wide temperature range and has strong environmental adaptability. As a temporary power supply, the super capacitor can continue to provide power for the RTC when the battery power is insufficient. The composite energy storage design of the super capacitor and the button cell can effectively improve the stability and reliability of the system in various harsh environments, avoid the shutdown or data loss problem of the system due to battery failure or power consumption, and ensure that the RTC can continuously and stably work. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a real-time RTC clock power supply circuit schematic diagram of the hybrid inverter of the application.

[0033] Figure 2 is another real-time RTC clock power supply circuit schematic diagram of the hybrid inverter of the application. DETAILED DESCRIPTION

[0034] The following description is used to disclose the application so that those skilled in the art can implement the application. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art.

[0035] As shown in Figure 1 The application provides a hybrid inverter real-time RTC clock power supply circuit, which comprises an inverter, a super capacitor, a battery, a MOS tube Q1, a MOS tube Q2 and an RTC clock; the inverter and the super capacitor are connected in parallel and connected with the RTC clock; the RTC clock is further connected with the battery through the MOS tube Q1; the battery is further connected with the MOS tube Q2; wherein,

[0036] When the main power supply is normal, the inverter is powered;

[0037] When the main power supply is interrupted, the MOS tube Q2 is turned on and the MOS tube Q1 is turned off, and the super capacitor is responsible for continuous power supply to the RTC clock circuit; the super capacitor has a faster response time and a higher energy density, can stably output current in a short time, and ensures that the system can smoothly transition. With the discharge of the super capacitor, the capacitor voltage will gradually decrease. When the super capacitor is discharged to a set threshold, the MOS tube Q2 is turned off and the MOS tube Q1 is turned on, and the system is switched to the battery for continuous power supply, so as to keep the RTC module continuously working and ensure that the time data will not be lost.

[0038] The battery will continue to provide stable low-power supply for the RTC module until the main power supply is restored or the battery power reaches the limit, once the battery is connected to the system and starts to supply power. Preferably, the battery is a button battery, but not limited to this.

[0039] The application optimizes the power supply switching process by intelligently switching the MOS tube, reasonably utilizing the combination of inverter, super capacitor and battery, and ensures the stability and reliability of power supply.

[0040] Preferably, the inverter is powered by an internal DC / DC; wherein, in the normal working state, the inverter obtains power supply through the internal DC / DC converter. The DC / DC converter converts the input DC power into a stable voltage suitable for the operation of the inverter. Through the use of DC / DC converter, the inverter can more efficiently manage the power supply, while improving the stability and reliability of the entire system.

[0041] One end of the inverter is also connected to the positive electrode of diode D1, and the negative electrode of diode D1 is connected to the RTC clock. The function of D1 is to ensure that the super capacitor and the battery only supply power to the RTC, prevent the consumption of RTC power on other circuits, ensure the directionality of the power supply, and prevent possible circuit damage.

[0042] One end of the super capacitor is connected to resistor R4, and the other end of the resistor R4 is connected to the RTC clock. The resistor R4 controls the discharge speed of the super capacitor, ensures stable current supply, and prevents the instantaneous release of capacitor power, which affects the stability of the RTC clock module.

[0043] Further, when the main power supply is normal, the inverter is powered by the internal DC / DC (such as LDO_DC), and at the same time, the super capacitor is kept floating through D1 and R4.

[0044] The other end of the super capacitor is also connected to the gate of MOS tube Q2;

[0045] The source of the MOS tube Q2 is connected to the negative electrode of the battery;

[0046] The drain of the MOS tube Q2 is connected to the positive electrode of the battery through the resistor R2.

[0047] The positive electrode of the battery is connected to the drain of the MOS tube Q1;

[0048] The gate of the MOS tube Q1 is connected to the drain of the MOS tube Q2;

[0049] The source of the MOS tube Q1 is connected to the RTC clock.

[0050] In order to realize reverse current protection and ensure the normal work of the circuit, the source and the drain of the MOS tube Q1 are also connected with a diode D3; the positive pole of the diode D3 is connected with the source of the MOS tube Q1, and the negative pole of the diode D3 is connected with the drain of the MOS tube Q1, wherein the diode D3 is used to prevent the reverse flow of current when the circuit switches the power supply or an abnormality occurs, and to protect the MOS tube and other circuit elements.

[0051] The drain of the MOS tube Q1 is also connected with a diode D2, the positive pole of the diode D2 is connected with the positive pole of the battery, and the negative pole of the diode D2 is connected with the RTC clock, wherein the diode D2 is used to prevent the LDO_DC from charging the button battery, thereby causing damage to the battery.

[0052] The super capacitor and the gate of the MOS tube Q2 are also connected with a resistor R3 and a resistor R1 in series. The resistor R1 is used to adjust the gate voltage of the MOS tube Q2, and to control the opening or closing characteristics thereof.

[0053] The resistor R3 is also connected with a resistor R6.

[0054] The other end of the resistor R6 is connected with the RTC clock.

[0055] Preferably, the resistor R3 and the resistor R6 are adjusted to set the discharge threshold of the super capacitor. The resistor R6 and the resistor R3 work together to further adjust and accurately control the voltage distribution in the circuit, so as to ensure that the discharge process of the super capacitor meets the design requirements. The value of the resistor R6 can optimize the discharge characteristics of the capacitor, and set a suitable voltage range. When the super capacitor is discharged to the set threshold, the system can timely switch the power supply, so as to avoid the instability or failure of the circuit due to the excessively low voltage of the capacitor, and to set a voltage threshold most suitable for the system according to the actual requirements. The threshold determines when the super capacitor starts to switch the power supply to the battery and when the super capacitor terminates the power supply, thereby avoiding the damage to the battery and the capacitor caused by excessive discharge. The cooperation of the super capacitor and the button battery is more balanced, which helps to improve the overall efficiency and stability of the power supply system.

[0056] As shown in Figure 2 The hybrid inverter real-time RTC clock power supply circuit provided by the application can also supply power simultaneously by the super capacitor and the battery. In the embodiment, the super capacitor and the battery are connected in parallel and then connected directly with the RTC clock, and are also connected in parallel with the inverter.

[0057] Whether the super capacitor supplies power preferentially or the super capacitor and the battery supply power simultaneously, when the main power supply is restored, the main power supply of the inverter is automatically switched back, and the super capacitor is charged.

[0058] The foregoing generally describes the principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

[0059] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present application should be covered by the claims of the present application.

Claims

1. A hybrid inverter real-time RTC clock power supply circuit, characterized in that, Comprising: Inverter, super capacitor, battery, MOS Q1, MOS Q2 and RTC clock; the inverter and super capacitor are connected in parallel and connected with RTC clock; the RTC clock is also connected with battery through MOS Q1; the battery is also connected with MOS Q2; wherein, When the main power is normal, the inverter is powered; When the main power is interrupted, MOS Q2 is turned on, MOS Q1 is turned off, and the super capacitor is discharged; when the super capacitor is discharged to a set threshold, MOS Q2 is turned off, MOS Q1 is turned on, and the battery is switched to continue to supply power.

2. A hybrid inverter real-time RTC clock supply circuit according to claim 1, wherein, Also comprising: The inverter is powered by internal DC / DC; One end of the inverter is also connected to diode D1, and the other end of the diode D1 is connected to the RTC clock.

3. A hybrid inverter real-time RTC clock supply circuit according to claim 2, wherein, Also comprising: One end of the super capacitor is connected to resistor R4, and the other end of the resistor R4 is connected to the RTC clock.

4. A hybrid inverter real-time RTC clock power supply circuit according to claim 3, wherein, Also comprising: The other end of the super capacitor is also connected to the gate of MOS Q2; The source of MOS Q2 is connected to the negative electrode of the battery; The drain of MOS Q2 is connected to the positive electrode of the battery through resistor R2.

5. A hybrid inverter real-time RTC clock supply circuit according to claim 4, wherein, Also comprising: The positive electrode of the battery is connected to the drain of MOS Q1; The gate of MOS Q1 is connected to the drain of MOS Q2; The source of MOS Q1 is connected to the RTC clock.

6. A hybrid inverter real-time RTC clock supply circuit according to claim 5, wherein, Also comprising: The diode D3 is also connected between the source and drain of MOS Q1; The diode D2 is also connected between the drain of MOS Q1 and the positive electrode of the battery.

7. A hybrid inverter real-time RTC clock supply circuit according to claim 6, wherein, Also comprising: The resistor R3 and resistor R1 are also connected in series between the super capacitor and the gate of MOS Q2.

8. A hybrid inverter real-time RTC clock supply circuit according to claim 7, wherein, Also comprising: The resistor R3 is also connected to resistor R6; The other end of resistor R6 is connected to the RTC clock.

9. A hybrid inverter real-time RTC clock supply circuit according to claim 8, wherein, Also comprising: Adjust the resistor R3 and resistor R6 to set the set threshold of the super capacitor discharge.

10. A hybrid inverter real-time RTC clock power supply circuit according to any one of claims 1-9, characterized in that, Also comprising: The super capacitor and the battery can also supply power at the same time; When the main power is restored, switch back to the inverter main power supply, and charge the super capacitor.

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