Power supply circuit of real-time clock chip

Abstract

According to the technical scheme disclosed by the embodiment of the utility model, the extra charging circuit is used for charging the super capacitor energy storage circuit, and the switch control circuit of the extra charging circuit is used for controlling the switch-on and switch-off of the extra charging circuit so as to start or stop the charging process of the super capacitor. Therefore, the problem of short working time caused by large leakage current of the super capacitor is solved, so that the super capacitor can work for a long time, and enough working power supply is provided for the real-time clock chip. Besides, only when the auxiliary power supply of the real-time clock chip cannot be started, the super-capacitor energy storage circuit supplies power to the real-time clock chip and provides a working power supply for the real-time clock chip through the digital power supply pin of the real-time clock chip, so that the power consumption of a super-capacitor in the super-capacitor energy storage circuit can be reduced, and the service time of the super-capacitor energy storage circuit is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the power supply technical field of photovoltaic power generation system especially, a kind of power supply circuit of real-time clock chip. BACKGROUND

[0002] RTC chip, namely Real_Time Clock chip, is an integrated circuit, usually called real-time clock chip, is one of the most widely used consumer electronics in daily life.At present, the power supply applied to RTC chip is mostly button-type lithium battery and additional management IC (Integrated Circuit), and its main disadvantage is that the temperature range is narrow when using button-type lithium battery for charging and discharging operation, which cannot be applied to low temperature condition in higher latitude, and in the related technology, lithium ion capacitor is also used to replace button-type lithium battery to solve the problem of narrow temperature range, but the cost of this scheme is high. SUMMARY

[0003] To solve the above technical problems, the embodiment of the utility model provides a kind of power supply circuit of real-time clock chip.

[0004] According to the power supply circuit of real-time clock chip provided by the embodiment of the utility model, the power supply circuit includes additional charging circuit, switch control circuit of additional charging circuit and super capacitor energy storage circuit, wherein:

[0005] The super capacitor energy storage circuit includes super capacitor, first diode and first stabilized power supply, the super capacitor and the first stabilized power supply are connected by the first diode, the super capacitor energy storage circuit is electrically connected with the digital power supply pin of the real-time clock chip, when the auxiliary power supply of the real-time clock chip cannot be started, the first diode prevents the super capacitor from discharging to the first stabilized power supply, so that the super capacitor supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip, and provides working power supply;

[0006] The additional charging circuit is electrically connected with the super capacitor energy storage circuit, charges the super capacitor in the super capacitor energy storage circuit when the auxiliary power supply of the real-time clock chip cannot be started, so that the super capacitor supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip, and provides working power supply;

[0007] The switch control circuit of additional charging circuit is electrically connected with the additional charging circuit, and is used to open or close the additional charging circuit to charge the super capacitor in the super capacitor energy storage circuit.

[0008] According to the utility model one embodiment, the additional charging circuit includes first resistance R137, second resistance R143, third resistance R155, fourth resistance R118, fifth resistance R128, sixth resistance R117 and seventh resistance R120, and includes first voltage stabilizing diode ZD5, second voltage stabilizing diode ZD6, first voltage dropping diode ZD7, second voltage dropping diode D42, first PNP type triode Q18, first NPN type triode Q19 and second NPN type triode Q20, wherein,

[0009] One end of the additional charging circuit is connected with external power supply PV+, to obtain power supply from the external power supply PV+, and the external power supply PV+ is grounded through the first resistance R137, the second resistance R143 and the third resistance R155, to constitute a voltage dividing circuit.

[0010] The first NPN type triode Q19, the seventh resistance R120 and the second voltage stabilizing diode ZD6 are electrically connected, to constitute a linear voltage stabilizer circuit.

[0011] The first voltage dropping diode ZD7 and the second voltage dropping diode D42 are electrically connected, to constitute a voltage dropping circuit.

[0012] One end of the voltage dividing circuit is electrically connected to one end of the linear voltage stabilizer circuit through the first voltage stabilizing diode ZD5, the second NPN type triode, the first PNP type triode Q18 and the sixth resistance R117.

[0013] The other end of the linear voltage stabilizer circuit is electrically connected to one end of the voltage dropping circuit, to perform voltage dropping processing on the output voltage of the linear voltage stabilizer circuit through the voltage dropping circuit.

[0014] The other end of the voltage dropping circuit is electrically connected to the supercapacitor energy storage circuit, to charge the supercapacitor in the supercapacitor energy storage circuit.

[0015] According to the utility model one embodiment, the switch control circuit of the additional charging circuit includes eighth resistance R148, ninth resistance R156, tenth resistance R146, first patch capacitor C70, second patch capacitor C69 and third NPN type triode Q26, to perform conduction control on the third NPN type triode Q26 through the eighth resistance R148, the ninth resistance R156 and the first patch capacitor C70, and to be connected to the additional charging circuit through the tenth resistance R146 and the second patch capacitor C69, to control to open or close the additional charging circuit to charge the supercapacitor in the supercapacitor energy storage circuit.

[0016] Based on the technical scheme provided by the above embodiment of the utility model, the super capacitor energy storage circuit is charged through the additional charging circuit, and the additional charging circuit is controlled to open and close through the switch control circuit of the additional charging circuit, so that the charging process of the super capacitor is started or stopped, thereby making up for the problem that the working time is short due to the large leakage current of the super capacitor, so that the super capacitor can work for a long time, so as to ensure that enough working power supply is provided for the real-time clock chip. In addition, the super capacitor energy storage circuit only supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip when the auxiliary power supply of the real-time clock chip cannot be started, and provides working power supply, so that the super capacitor in the super capacitor energy storage circuit reduces power consumption, thereby increasing the use time.

[0017] The technical scheme of the utility model will be described in further detail below by means of the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the utility model will become more apparent through the following detailed description of the embodiments of the utility model taken with reference to the accompanying drawings. The accompanying drawings are used to provide further understanding of the embodiments of the utility model and constitute a part of the specification, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation on the utility model. In the drawings, the same reference numerals generally represent the same components or steps.

[0019] Figure 1 It is the circuit structure schematic view of the power supply circuit of the real-time clock chip provided by an exemplary embodiment of the utility model. DETAILED DESCRIPTION

[0020] Hereinafter, the example embodiments according to the utility model will be described in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments of the utility model, and it should be understood that the utility model is not limited by the example embodiments described here.

[0021] It should be noted that: the relative arrangement, numerical expression and numerical value of the components and steps set forth in these embodiments do not limit the scope of the utility model, unless otherwise specified.

[0022] Those skilled in the art can understand that the terms "first", "second" and the like in the embodiments of the utility model are only used to distinguish different steps, devices or modules, and do not represent any specific technical meaning, nor do they represent the inevitable logical order between them.

[0023] It should also be understood that in the embodiments of the utility model, "a plurality of" can mean two or more, and "at least one" can mean one, two or more.

[0024] It should also be understood that, with respect to any part, data or structure mentioned in the embodiments of the present application, one or more can be understood in general without explicit limitation or in the context of the opposite implication.

[0025] In addition, the term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0026] It should also be understood that the description of the present application focuses on the differences between the various embodiments, and the same or similar parts can be referred to each other, and for the sake of brevity, will not be repeated.

[0027] At the same time, it should be understood that, in order to facilitate the description, the size of each part shown in the drawing is not drawn according to the actual proportion relationship.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application or its application or uses.

[0029] The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the technology, methods and devices should be considered as part of the specification.

[0030] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0031] The embodiments of the present application can be applied to terminal devices, computer systems, servers and other electronic devices, which can be operated with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with terminal devices, computer systems, servers and other electronic devices include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems and distributed cloud computing technology environments including any of the above systems, etc.

[0032] Electronic devices such as terminal devices, computer systems, servers, and the like can be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules can include routines, programs, objects, components, logic, data structures, and the like, that perform particular tasks or implement particular abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment where tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules can be located in local or remote computer system storage media including storage devices.

[0033] In order for those skilled in the art to accurately and clearly understand the technical scheme of the utility model, the technical scheme of the utility model is described in detail by way of example.

[0034] In a photovoltaic power generation system, due to weather conditions, shadow effect and solar panel aging and other factors, the output voltage of the photovoltaic panel may be reduced. When the photovoltaic panel is powered by an MPPT (Maximum Power Point Tracking, MPPT for short) charger, the auxiliary power supply part therein will be started first to supply 12V voltage for the MPPT charger, and then provide 5V voltage and RTC chip (Real Time Clock Chip) operating voltage (3.3V).

[0035] However, the RTC chip (Real Time Clock Chip) needs to be powered when the auxiliary power supply is started, and when the conditions are insufficient to start the auxiliary power supply, it cannot be powered. However, the RTC chip (Real Time Clock Chip) needs to ensure correct time recording, so it needs continuous power supply. The power supply needs to provide enough power for the chip to work for a long time after the power is cut off. Generally, a button-type lithium battery with a theoretical maintenance time of more than 791 days and a management IC are used, but its working temperature range is generally -20℃-60℃, which cannot meet some more extreme temperature ranges, so it cannot ensure the stability of work in some high-latitude areas. The LIC lithium ion capacitor can maintain for a long time after being fully charged, about 208 days, and its working temperature range is wider, up to -40°C-70°C, which can adapt to related situations, but its cost is relatively high, which cannot meet the demand.

[0036] Therefore, the utility model provides a real-time clock chip power supply circuit for solving the technical problems in the related art.

[0037] The real-time clock chip power supply circuit provided by the utility model can include an additional charging circuit, a switch control circuit of the additional charging circuit and a super capacitor energy storage circuit, wherein:

[0038] The super capacitor energy storage circuit can include a super capacitor, a first diode and a first voltage stabilizing power supply, the super capacitor and the first voltage stabilizing power supply are connected through the first diode, the super capacitor energy storage circuit is electrically connected with a digital power supply pin of the real-time clock chip, when the auxiliary power supply of the real-time clock chip cannot be started, the first diode prevents the super capacitor from discharging to the first voltage stabilizing power supply, so that the super capacitor supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip to provide working power supply;

[0039] The additional charging circuit is electrically connected with the super capacitor energy storage circuit, and charges the super capacitor in the super capacitor energy storage circuit when the auxiliary power supply of the real-time clock chip cannot be started, so that the super capacitor supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip to provide working power supply;

[0040] The switch control circuit of the additional charging circuit is electrically connected with the additional charging circuit, and is used for turning on or off the additional charging circuit to charge the super capacitor in the super capacitor energy storage circuit.

[0041] Figure 1 It is a circuit structure schematic view of the power supply circuit of the real-time clock chip provided by an exemplary embodiment of the utility model.

[0042] As Figure 1 The additional charging circuit includes a first resistor R137, a second resistor R143, a third resistor R155, a fourth resistor R118, a fifth resistor R128, a sixth resistor R117 and a seventh resistor R120, and includes a first voltage stabilizing diode ZD5, a second voltage stabilizing diode ZD6, a first voltage reducing diode ZD7, a second voltage reducing diode D42, a first PNP type triode Q18, a first NPN type triode Q19 and a second NPN type triode Q20, wherein,

[0043] One end of the additional charging circuit is connected with an external power supply PV+, so as to obtain power supply from the external power supply PV+, and the external power supply PV+ is grounded through the first resistor R137, the second resistor R143 and the third resistor R155, thereby forming a voltage dividing circuit;

[0044] The first NPN type triode Q19, the seventh resistor R120 and the second voltage stabilizing diode ZD6 are electrically connected to form a linear voltage stabilizer circuit;

[0045] The first voltage reducing diode ZD7 and the second voltage reducing diode D42 are electrically connected to form a voltage reducing circuit;

[0046] One end of the voltage dividing circuit is electrically connected to one end of the linear voltage stabilizer circuit through the first voltage stabilizing diode ZD5, the second NPN triode, the first PNP triode Q18 and the sixth resistor R117.

[0047] The other end of the linear voltage stabilizer circuit is electrically connected to one end of the voltage reducing circuit to reduce the output voltage of the linear voltage stabilizer circuit through the voltage reducing circuit.

[0048] The other end of the voltage reducing circuit is electrically connected to the super capacitor energy storage circuit to charge the super capacitor in the super capacitor energy storage circuit.

[0049] In addition, the switch control circuit of the additional charging circuit comprises an eighth resistor R148, a ninth resistor R156, a tenth resistor R146, a first patch capacitor C70, a second patch capacitor C69 and a third NPN triode Q26 to control the conduction of the third NPN triode Q26 through the eighth resistor R148, the ninth resistor R156 and the first patch capacitor C70, and to be connected to the additional charging circuit through the tenth resistor R146 and the second patch capacitor C69 to control the opening or closing of the additional charging circuit to charge the super capacitor in the super capacitor energy storage circuit.

[0050] In addition, the super capacitor energy storage circuit can comprise a super capacitor EC10, a first diode (for example, a general diode) D38 and a first voltage stabilizing power supply (3.3V_D in the figure).

[0051] Based on the technical scheme provided in the above embodiments of the utility model, the super capacitor energy storage circuit is charged through the additional charging circuit, and the opening and closing of the additional charging circuit are controlled through the switch control circuit of the additional charging circuit to open or close the charging process of the super capacitor, so as to make up for the problem that the working time is short due to the large leakage current of the super capacitor, so that the super capacitor can work for a long time to ensure that enough working power supply is provided for the real-time clock chip. In addition, the super capacitor energy storage circuit only provides power supply for the real-time clock chip through the digital power supply pin of the real-time clock chip when the auxiliary power supply of the real-time clock chip cannot be started, so as to provide working power supply, so that the super capacitor in the super capacitor energy storage circuit can reduce power consumption, thereby increasing the use time.

[0052] The basic principle of the utility model is described above in combination with specific embodiments, however, it is necessary to point out that the advantages, advantages, effects and the like mentioned in the utility model are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the various embodiments of the utility model must have. In addition, the above-mentioned specific details disclosed are only for the purpose of example and for the purpose of understanding, and not for the purpose of limitation, and the above-mentioned details do not limit the utility model to the above-mentioned specific details.

[0053] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be mutually referred to. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the related parts can refer to the part of the method embodiment.

[0054] The block diagram of the device, apparatus, equipment and system involved in the utility model is only an illustrative example and is not intended to require or imply that the connection, arrangement and configuration must be as shown in the block diagram. As those skilled in the art will recognize, these devices, apparatuses, equipment and systems can be connected, arranged and configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, which mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0055] The method and device of the utility model can be implemented in many ways. For example, the method and device of the utility model can be implemented by software, hardware, firmware or any combination of software, hardware and firmware. The above-mentioned order of steps for the method is only for illustration, and the steps of the method of the utility model are not limited to the above-mentioned order, unless otherwise specifically stated. In addition, in some embodiments, the utility model can also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the utility model. Therefore, the utility model also covers the recording medium for storing the program for executing the method according to the utility model.

[0056] It is also necessary to point out that in the device, equipment and method of the utility model, each component or each step can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the utility model.

[0057] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the inventive concepts. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the inventive concepts. Thus, the present inventive concepts are not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0058] The above description has been presented for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the inventive concepts to the forms disclosed herein. Although various example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations of the described aspects and embodiments.

Claims

1. A power supply circuit for a real-time clock chip, characterized by The power supply circuit comprises an additional charging circuit, a switch control circuit of the additional charging circuit and a super capacitor energy storage circuit, wherein: The super capacitor energy storage circuit comprises a super capacitor, a first diode and a first voltage stabilizing power supply, the super capacitor and the first voltage stabilizing power supply are connected through the first diode, the super capacitor energy storage circuit is electrically connected with a digital power supply pin of the real-time clock chip, when the auxiliary power supply of the real-time clock chip cannot be started, the first diode prevents the super capacitor from discharging to the first voltage stabilizing power supply, so that the super capacitor supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip to provide working power supply; The additional charging circuit is electrically connected with the super capacitor energy storage circuit, and charges the super capacitor in the super capacitor energy storage circuit when the auxiliary power supply of the real-time clock chip cannot be started, so that the super capacitor supplies power to the real-time clock chip through the digital power supply pin of the real-time clock chip to provide working power supply; The switch control circuit of the additional charging circuit is electrically connected with the additional charging circuit, and is used for turning on or off the additional charging circuit to charge the super capacitor in the super capacitor energy storage circuit.

2. The power supply circuit for a real time clock chip according to claim 1, wherein The additional charging circuit comprises a first resistor (R137), a second resistor (R143), a third resistor (R155), a fourth resistor (R118), a fifth resistor (R128), a sixth resistor (R117) and a seventh resistor (R120), and comprises a first voltage stabilizing diode (ZD5), a second voltage stabilizing diode (ZD6), a first voltage reducing diode (ZD7), a second voltage reducing diode (D42), a first PNP triode (Q18), a first NPN triode (Q19) and a second NPN triode (Q20), wherein One end of the additional charging circuit is connected with an external power supply (PV+) to obtain power supply from the external power supply (PV+), and the external power supply (PV+) is grounded through the first resistor (R137), the second resistor (R143) and the third resistor (R155) to form a voltage dividing circuit; The first NPN triode (Q19), the seventh resistor (R120) and the second voltage stabilizing diode (ZD6) are electrically connected to form a linear voltage stabilizer circuit; The first voltage reducing diode (ZD7) and the second voltage reducing diode (D42) are electrically connected to form a voltage reducing circuit; One end of the voltage dividing circuit is electrically connected to one end of the linear voltage stabilizer circuit through the first voltage stabilizing diode (ZD5), the second NPN triode, the first PNP triode (Q18) and the sixth resistor (R117); The other end of the linear voltage stabilizer circuit is electrically connected to one end of the voltage reducing circuit to reduce the output voltage of the linear voltage stabilizer circuit through the voltage reducing circuit; The other end of the voltage reducing circuit is electrically connected to the super capacitor energy storage circuit to charge the super capacitor in the super capacitor energy storage circuit.

3. The power supply circuit for a real-time clock chip according to claim 1 or 2, wherein The switch control circuit of the additional charging circuit comprises an eighth resistor (R148), a ninth resistor (R156), a tenth resistor (R146), a first patch capacitor (C70), a second patch capacitor (C69), and a third NPN type transistor (Q26) to control the conduction of the third NPN type transistor (Q26) through the eighth resistor (R148), the ninth resistor (R156), and the first patch capacitor (C70), and to be connected to the additional charging circuit through the tenth resistor (R146) and the second patch capacitor (C69) to control the opening or closing of the additional charging circuit to charge the super capacitor in the super capacitor energy storage circuit.

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