CN217692702U - RTC module power supply circuit, RTC circuit and electronic equipment - Google Patents
RTC module power supply circuit, RTC circuit and electronic equipment Download PDFInfo
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- CN217692702U CN217692702U CN202220862690.1U CN202220862690U CN217692702U CN 217692702 U CN217692702 U CN 217692702U CN 202220862690 U CN202220862690 U CN 202220862690U CN 217692702 U CN217692702 U CN 217692702U
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Abstract
The application relates to the field of electronic circuits, in particular to a RTC module power supply circuit, an RTC circuit and electronic equipment, wherein the RTC module power supply circuit comprises an energy storage circuit, a charging circuit and a voltage stabilizing circuit; the input end of the charging circuit is used for being connected with a first power supply, and the first power supply is also used for directly or indirectly supplying power to the RTC module; the output end of the charging circuit is connected with the energy storage circuit; the energy storage circuit is also used for being connected with the RTC module to serve as a second power supply of the RTC module; the voltage stabilizing circuit is connected with the energy storage circuit in parallel and used for stabilizing the voltage of the energy storage circuit when the energy storage circuit is fully charged. The problem that traditional RTC module supply circuit structure is complicated and appear overcharging easily has been solved in this application, and circuit structure simply realizes easily.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a RTC module power supply circuit, an RTC circuit and electronic equipment.
Background
The Real-Time Clock (RTC) module is used for metering and synchronizing Time, RTC modules are designed on many electronic products, and the RTC module needs to be operated within a certain Time when the product is not powered, so that a standby power supply needs to be used. In order to ensure that the electric quantity of the standby power supply meets the requirement when the standby power supply needs to be used, the standby power supply needs to be charged frequently. The charging circuit of the traditional standby power supply is complex in structure and is easy to cause the problem of overcharge.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present application provide a RTC module power supply circuit, an RTC circuit and an electronic device, and aim to solve the problem that the RTC module power supply circuit is complex in structure and is prone to overcharging.
A first aspect of an embodiment of the present application provides a RTC module power supply circuit, including an energy storage circuit, a charging circuit, and a voltage stabilizing circuit;
the input end of the charging circuit is used for being connected with a first power supply, and the first power supply is also used for directly or indirectly supplying power to the RTC module; the output end of the charging circuit is connected with the energy storage circuit; the energy storage circuit is also used for being connected with the RTC module to serve as a second power supply of the RTC module;
the voltage stabilizing circuit is connected with the energy storage circuit in parallel and used for stabilizing the voltage of the energy storage circuit when the energy storage circuit is fully charged.
In one embodiment, the energy storage circuit comprises an energy storage battery;
the positive pole of the energy storage battery is connected with the output end of the charging circuit, the positive pole of the energy storage battery is also used for being connected with the RTC module, and the negative pole of the energy storage battery is grounded.
In one embodiment, the energy storage battery is a rechargeable button battery.
In one embodiment, the charging circuit comprises a first diode; the voltage stabilizing circuit comprises a first resistor;
the anode of the first diode is used for being connected with the first power supply, and the cathode of the first diode is respectively connected with the voltage stabilizing circuit and the energy storage circuit; the first end of the first resistor is connected with the negative electrode of the first diode, and the second end of the first resistor is grounded.
In one embodiment, the device further comprises a current limiting circuit; the current limiting circuit is connected in series between the charging circuit and the energy storage circuit and is used for limiting the current when the charging circuit charges the energy storage circuit.
In one embodiment, the power supply further comprises an isolation circuit, wherein the isolation circuit is connected in series to the input end of the voltage stabilizing circuit and is used for isolating the electric energy input to the voltage stabilizing circuit.
In one embodiment, the anti-reverse circuit is further included; the anti-reverse circuit is respectively connected with the energy storage circuit and the input end of the voltage stabilizing circuit, and is used for preventing the electric energy of the energy storage circuit from being output to the voltage stabilizing circuit.
A second aspect of an embodiment of the present application provides an RTC circuit, including the RTC module power supply circuit in any of the above embodiments.
A third aspect of embodiments of the present application provides an electronic device, including the RTC circuit provided in the second aspect of the embodiments.
In one embodiment, the system further comprises an MCU; the RTC module is integrated in the MCU or arranged outside the MCU and powered by the MCU; and the power supply pin of the MCU is used for being connected with the first power supply.
The RTC module power supply circuit in this application embodiment will be used for being connected to tank circuit for the first power of RTC module power supply through charging circuit, when the RTC module power supply is given to first power, charge for tank circuit simultaneously, tank circuit is when first power falls the electricity, supply power for the RTC module as the second power, guarantee that the RTC module lasts normal work, above-mentioned power supply circuit's simple structure, and voltage stabilizing circuit can stabilize the voltage on the tank circuit under the full charge condition of tank circuit, thereby can effectively avoid the overcharge problem that tank circuit appears.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a RTC module power supply circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a RTC module power supply circuit according to another embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a RTC module power supply circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a RTC module power supply circuit according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a RTC module power supply circuit according to another embodiment of the present application;
FIG. 6 is a schematic circuit diagram of a RTC module power supply circuit according to another embodiment of the present application;
FIG. 7 is a schematic diagram of an RTC circuit according to an embodiment of the present application;
fig. 8 is a schematic diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The RTC module is used for measuring and synchronizing time, all design the RTC module on many electronic products, and this module need realize not supplying power when the product, also must guarantee that the RTC module works in a certain period, this just needs to be used stand-by power supply, and the electric quantity will satisfy the demand when guaranteeing stand-by power supply needs to use simultaneously, needs often charge stand-by power supply, but stand-by power supply appears the overcharge problem when charging easily. The RTC module power supply circuit can adopt button cell to make stand-by power supply, but after the electronic product outage a period, the electric quantity of this button cell will exhaust, then follow-up time synchronization function under the unable completion outage circumstances to overcharge the problem easily appears when charging stand-by power supply.
As shown in FIG. 1, a first aspect of the embodiments of the present application provides an RTC module power supply circuit 10, the RTC module power supply circuit 10 includes a charging circuit 100, a tank circuit 200 and a regulator circuit 300. The input end of the charging circuit 100 is used for being connected with a first power source VCC, the first power source VCC is further used for directly or indirectly supplying power to the RTC module 20, the output end of the charging circuit 100 is connected with the energy storage circuit 200, and the energy storage circuit 200 is further used for being connected with the RTC module 20 to serve as a second power source of the RTC module 20. When the first power VCC stops supplying power, the second power serves as a standby power for the RTC module 20, and maintains the RTC module 20 to continue working normally for a certain time. The voltage stabilizing circuit 300 is connected in parallel with the tank circuit 200, and the voltage stabilizing circuit 300 is used for stabilizing the voltage of the tank circuit 200 when the tank circuit 200 is fully charged, so that the overcharge problem of the tank circuit 200 is effectively avoided.
The RTC module power supply circuit 10 that the first aspect of the embodiment of this application provided, the first power VCC that will be used for RTC module 20 power supply is connected to tank circuit 200 through charging circuit 100, when RTC module 20 power supply is given to first power VCC, charge for tank circuit 200 simultaneously, tank circuit 200 falls when first power VCC falls, give RTC module 20 power supply as the second power, guarantee that RTC module 20 lasts normal work, voltage stabilizing circuit 300 can be under the condition that tank circuit 200 is full of the electricity, stabilize the voltage on tank circuit 200, can effectively avoid tank circuit 200 overcharging, the complicated and easily existing problem of overcharging of traditional RTC module power supply circuit structure has been solved.
Referring to fig. 2, in an embodiment, the energy storage circuit 200 includes an energy storage battery 210, a positive electrode of the energy storage battery 210 is connected to the output terminal of the charging circuit 100, and a positive electrode of the energy storage battery 210 is further connected to the RTC module 20, wherein the energy storage battery 210 may be a single battery V1. In some embodiments, the energy storage battery 210 may also be composed of a plurality of batteries connected in series or in parallel. The number of batteries included in the energy storage battery 210 may be set as needed. For example, the required power can be determined by maintaining the maximum operable time of the RTC module 20 and the overall power consumption in the corresponding mode according to the requirement, and how many batteries need to be connected in parallel to obtain the operating voltage can also be designed according to the operating voltage of the RTC module 20. The energy storage battery 210 can store electric energy as a backup power supply of the RTC module 20, the energy storage battery 210 can be repeatedly charged and discharged for use, and the electric quantity is exhausted, i.e. the charging circuit 100 can be used for charging, so as to maintain the normal timing function of the RTC module 20.
Referring to fig. 2, in one embodiment, the energy storage battery 210 is a rechargeable button battery. For example, a 2V rechargeable button cell battery may be selected. The rechargeable button battery has low voltage and low charging current, and the charging current can meet the charging requirement at mA level, so that the whole power consumption is low, and the whole equipment cannot be subjected to large power consumption. The rechargeable button battery has the advantage of small volume, and the rechargeable button battery is adopted as a standby power supply of the RTC module 20 in various electronic products, so that the miniaturization of the electronic products is facilitated, the rechargeable button battery can be repeatedly charged and discharged, the service life of the battery is long, and the working stability of the RTC module 20 is favorably improved.
Referring to fig. 3, in one embodiment, the charging circuit 100 includes a first diode D1, and the voltage regulator circuit 300 includes a first resistor R1. The anode of the first diode D1 is used for being connected with a first power VCC, and the cathode of the first diode D1 is respectively connected with the voltage stabilizing circuit 300 and the energy storage circuit 200. A first end of the first resistor R1 is connected to a negative electrode of the first diode D1, and a second end of the first resistor R1 is grounded. The first diode D1 of the charging circuit 100 may provide a charging loop for the tank circuit 200, so as to charge the tank circuit 200. The first diode D1 also has another function, that is, it can prevent the energy storage circuit 200 from reversely supplying power to the first power VCC when the first power VCC stops supplying power. Usually, the first power VCC directly or indirectly supplies power to the RTC module 20, and at this time, when the first power VCC also supplies power to other modules, if the voltage in the energy storage circuit 200 flows back into the first power VCC, the device may not normally shut down the corresponding module, resulting in abnormality of the device. Therefore, the voltage of the energy storage circuit 200 can be effectively prevented from flowing backwards through the first diode D1, and the normal operation of the device is ensured.
In some other embodiments, the charging circuit 100 may further use a voltage dividing resistor, wherein the function of the voltage dividing resistor is similar to that of the first diode D1 in the above embodiments, the charging circuit 100 may further include other voltage dividing resistors on the basis of the first diode D1, the charging circuit 100 is configured to provide a charging loop between the first power source VCC and the energy storage circuit 200, and the specific circuit structure of the charging circuit 100 may include circuit elements such as diodes, resistors, and the like. The voltage regulator circuit 300 may also use a voltage regulator tube, wherein the function of the voltage regulator tube is similar to the first resistor R1 in the above-described embodiment. The specific circuit structures of the charging circuit 100 and the voltage stabilizing circuit 300 provided in the embodiments of the present application are not to be construed as limiting the present application.
When the tank circuit 200 is fully charged, the voltage across the tank circuit 200 is higher relative to the voltage of the tank circuit 200 when the tank circuit is not fully charged, and the charging current flowing through the tank circuit 200 is relatively small. Correspondingly, the voltage drop of the first diode D1 is related to the flowing current, and when the current is small enough to be ignored, the voltage drop of the first diode D1 is uncertain, so that most of the voltage of the first power VCC is output to the energy storage circuit 200, the voltage on the energy storage circuit 200 is higher than the full-power voltage of the energy storage circuit 200, and the problem of overcharge occurs. Therefore, in this embodiment, by adding the voltage stabilizing circuit 300, the first resistor R1 in the voltage stabilizing circuit 300 can ensure that when the battery in the energy storage circuit 200 is no longer charged, the current of the first diode D1 can still pass through the first resistor R1, thereby ensuring that the current flowing through the first diode D1 can also ensure the voltage drop across the first diode D1, that is, the divided voltage across the first diode D1 can be equal to the input voltage of the first power VCC minus the voltage across the battery V1, thereby stabilizing the voltage across the battery V1 and avoiding the occurrence of the overcharge problem.
Referring to fig. 4, in an embodiment, the RTC module power supply circuit 10 further includes a current limiting circuit 400, and the current limiting circuit 400 is connected in series between the charging circuit 100 and the energy storage circuit 200 for limiting a current when the charging circuit 100 charges the energy storage circuit 200, so as to improve circuit stability.
Referring to fig. 4, in an embodiment, the RTC module power supply circuit 10 further includes an isolation circuit 500, and the isolation circuit 500 is connected in series to the input terminal of the voltage regulator circuit 300 for isolating the power input to the voltage regulator circuit 300. In an embodiment, referring to fig. 6, the isolation circuit 500 includes a second diode D2, an anode of the second diode D2 is connected to a cathode of the first diode D1, a cathode of the second diode D2 is connected to the first end of the first resistor R1, and the second diode D2 plays an isolation role. In some embodiments, the RTC module power supply circuit 10 may not be provided with the isolation circuit 500.
Referring to fig. 5, in an embodiment, the RTC module power supply circuit 10 further includes an anti-reverse circuit 600, the anti-reverse circuit 600 is respectively connected to the energy storage circuit 200 and the input end of the voltage stabilizing circuit 300, and the anti-reverse circuit 600 is used for preventing the electric energy of the energy storage circuit 200 from being output to the voltage stabilizing circuit 300. In one embodiment, referring to fig. 5, a current limiting circuit 400 is further disposed between the anti-reflection circuit 600 and the tank circuit 200, and an isolation circuit 500 is further disposed between the anti-reflection circuit 600 and the voltage stabilizing circuit 300. In one embodiment, the positions of the anti-kickback circuit 600 and the current limit circuit 400 shown in fig. 5 may be interchanged.
Referring to fig. 6, in an embodiment, the reverse polarity protection circuit 600 includes a third diode D3, the current limiting circuit 400 includes a current limiting resistor R2, a cathode of the third diode D3 is connected to an anode of the second diode D2, an anode of the third diode D3 is connected to a first end of the current limiting resistor R2, and a second end of the current limiting resistor R2 is connected to an anode of the battery V1, wherein the third diode D3 plays a reverse polarity protection role, so as to prevent the electric energy of the battery V1 from being output to the voltage stabilizing circuit 300 when the first power VCC stops supplying power, and the first resistor R1 consumes the electric energy of the battery V1, which is beneficial to reducing the electric energy loss of the energy storage circuit 200. It is understood that the anti-reverse circuit 600 functions to prevent the electric power of the tank circuit 200 from being output to the voltage stabilizing circuit 300, and thus the positions of the anti-reverse circuit 600 and the current limiting circuit 400 shown in fig. 5 may be interchanged, i.e., the positions of the third diode D3 and the current limiting resistor R2 may be interchanged.
The RTC module power supply circuit 10 that the first aspect of the embodiment of this application provided, the first power VCC that will be used for RTC module 20 power supply is connected to tank circuit 200 through charging circuit 100, when RTC module 20 power supply is given to first power VCC, charge for tank circuit 200 simultaneously, tank circuit 200 falls when first power VCC falls, give RTC module 20 power supply as the second power, guarantee that RTC module 20 lasts normal work, above-mentioned RTC module power supply circuit 10's simple structure, and voltage stabilizing circuit 300 can stabilize the voltage on tank circuit 200 under the full charge condition of tank circuit 200, thereby can effectively avoid appearing tank circuit 200's overcharge problem.
Referring to fig. 7, a second aspect of the present invention provides an RTC circuit, which includes an RTC module 20 and the RTC module power supply circuit 10 provided by the first aspect of the present invention. The RTC module power supply circuit 10 is connected to the RTC module 20 and configured to supply power to the RTC module 20, and the RTC module power supply circuit 10 can maintain normal operation of the RTC module 20, so that the RTC module keeps a normal timing function. The RTC circuit can continuously maintain the RTC module 20 to operate for a certain time when the first power VCC of the RTC module power supply circuit 10 stops supplying power.
A third aspect of an embodiment of the present application provides an electronic device, where the electronic device includes an RTC circuit provided by the second aspect of the embodiment of the present application. The RTC circuit of the electronic device is used for measuring and synchronizing time, and maintaining the accuracy of time synchronization of the electronic device in a standby state. In some embodiments, the electronic device is, for example, an energy storage device, a mobile power source, a clean energy conversion device, or the like.
In one embodiment, please refer to fig. 8, the electronic device further includes an MCU, wherein the RTC module 20 is integrated in the MCU, as shown in fig. 8 (a), the electronic device 1 and the RTC module power supply circuit 10 are powered by the RTC module 20, when the electronic device 1 works normally, the RTC module power supply circuit 10 can provide power for itself through the power supply of the MCU, or can use a separate power supply. In other embodiments, the RTC module 20 is disposed outside the MCU and powered by the MCU, as shown in fig. 8 (b), in the electronic device 2, a power supply pin of the MCU is used to connect to a power supply of the MCU, i.e. the first power VCC, and the RTC module power supply circuit 10 can provide power for itself through the power supply of the MCU without separately providing a new power supply.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. The RTC module power supply circuit is characterized by comprising an energy storage circuit, a charging circuit and a voltage stabilizing circuit;
the input end of the charging circuit is used for being connected with a first power supply, and the first power supply is also used for directly or indirectly supplying power to the RTC module; the output end of the charging circuit is connected with the energy storage circuit; the energy storage circuit is also used for being connected with the RTC module to serve as a second power supply of the RTC module;
the voltage stabilizing circuit is connected with the energy storage circuit in parallel and used for stabilizing the voltage of the energy storage circuit when the energy storage circuit is fully charged.
2. The RTC module power supply circuit of claim 1, wherein the tank circuit comprises a tank battery;
the positive pole of the energy storage battery is connected with the output end of the charging circuit, the positive pole of the energy storage battery is also used for being connected with the RTC module, and the negative pole of the energy storage battery is grounded.
3. The RTC module power supply circuit of claim 2, wherein the energy storage battery is a rechargeable button battery.
4. The RTC module power supply circuit of claim 1, wherein the charging circuit comprises a first diode; the voltage stabilizing circuit comprises a first resistor;
the anode of the first diode is used for being connected with the first power supply, and the cathode of the first diode is respectively connected with the voltage stabilizing circuit and the energy storage circuit; the first end of the first resistor is connected with the negative electrode of the first diode, and the second end of the first resistor is grounded.
5. The RTC module power supply circuit of claim 1, further comprising a current limiting circuit; the current limiting circuit is connected in series between the charging circuit and the energy storage circuit and is used for limiting the current when the charging circuit charges the energy storage circuit.
6. The RTC module supply circuit of claim 5, further comprising an isolation circuit connected in series at the input of the voltage regulator circuit for isolating the power input to the voltage regulator circuit.
7. The RTC module power supply circuit of claim 1, further comprising an anti-kickback circuit; the anti-reverse circuit is respectively connected with the energy storage circuit and the input end of the voltage stabilizing circuit, and is used for preventing the electric energy of the energy storage circuit from being output to the voltage stabilizing circuit.
8. An RTC circuit comprising an RTC module and the RTC module power supply circuit of any of claims 1 to 7.
9. An electronic device comprising the RTC circuit of claim 8.
10. The electronic device of claim 9, further comprising an MCU; the RTC module is integrated in the MCU or arranged outside the MCU and powered by the MCU; and the power supply pin of the MCU is used for being connected with the first power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220862690.1U CN217692702U (en) | 2022-04-14 | 2022-04-14 | RTC module power supply circuit, RTC circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220862690.1U CN217692702U (en) | 2022-04-14 | 2022-04-14 | RTC module power supply circuit, RTC circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN217692702U true CN217692702U (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220862690.1U Active CN217692702U (en) | 2022-04-14 | 2022-04-14 | RTC module power supply circuit, RTC circuit and electronic equipment |
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| CN (1) | CN217692702U (en) |
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- 2022-04-14 CN CN202220862690.1U patent/CN217692702U/en active Active
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Address after: 518000 Factory Building 401, Runheng Industrial Plant 1, Fuyuan Road, Zhancheng Community, Fuhai Street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region after: China Address before: 518000, 1st Floor, Building E, Jiehe Industrial City, Shuitian Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region before: China |