CN111025887A - RTC circuit and RTC electronic product of circulation power supply - Google Patents
RTC circuit and RTC electronic product of circulation power supply Download PDFInfo
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- CN111025887A CN111025887A CN201911316209.8A CN201911316209A CN111025887A CN 111025887 A CN111025887 A CN 111025887A CN 201911316209 A CN201911316209 A CN 201911316209A CN 111025887 A CN111025887 A CN 111025887A
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- Prior art keywords
- rtc
- circuit
- power
- power supply
- electronic product
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
- G04G19/10—Arrangements for supplying back-up power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a RTC circuit and an RTC electronic product with circulating power supply, wherein the RTC circuit is arranged in the RTC electronic product and comprises an RTC circuit, a power-off holding circuit and a power supply circuit; when the RTC electronic product is in a normal working state or a standby state, the RTC electronic product supplies power to the RTC circuit through the power supply circuit and charges the power-off holding circuit at the same time; when the RTC electronic product is in a power-off state, the power-off holding circuit supplies power to the RTC circuit. According to the invention, the power-off holding circuit is arranged to charge the RTC electronic product when the RTC electronic product works normally or is in a standby state, and after the RTC electronic product is powered off, the power-off holding circuit supplies power to the RTC circuit, so that the power-off holding circuit can be charged and discharged circularly, and after the RTC electronic product is powered off for multiple times, the RTC circuit can still work normally, thereby ensuring the time synchronism.
Description
Technical Field
The invention relates to the field of RTC electronic products, in particular to a RTC circuit with circulating power supply and an RTC electronic product.
Background
The RTC is a real-time clock circuit and is used for metering and synchronizing time, a module is designed on a plurality of electronic products, and the module needs to realize a function, namely when the products are not powered, the time is ensured to be synchronized all the time, so that a standby power supply needs to be used, and a 3V button battery is used as the standby power supply at present; the button battery has the disadvantage that after the product is powered off for a period of time, the electric quantity of the button battery is exhausted, and the time synchronization function under the condition of power off cannot be completed subsequently.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a RTC circuit and an RTC electronic product with power supply in a circulating manner, in which a power-off holding circuit is arranged to charge the RTC electronic product when the RTC electronic product is in normal operation or standby, and when the RTC electronic product is powered off, the power-off holding circuit supplies power to the RTC circuit, so that the power-off holding circuit can be charged and discharged in a circulating manner, and after the RTC electronic product is powered off for multiple times, the RTC circuit can still work normally, thereby ensuring time synchronization.
In order to achieve the purpose, the invention adopts the following technical scheme:
a RTC circuit of circulation power supply, set up in RTC electronic product, including RTC module, outage hold circuit and power supply circuit; when the RTC electronic product is in a normal working state or a standby state, the RTC electronic product supplies power to the RTC module through the power supply circuit and charges a power-off holding circuit at the same time; when the RTC electronic product is in a power-off state, the power-off holding circuit supplies power to the RTC module.
The power supply circuit comprises a first power supply unit, a second power supply unit and a common cathode double diode; when the RTC electronic product is in a normal working state, the first power supply unit and the common cathode double diode are used for supplying power to the RTC module and charging a power-off holding circuit; when the RTC electronic product is in a standby state, the RTC module is powered and charges a power-off holding circuit through the second power supply unit and the common cathode double diode.
The first power supply unit comprises a first resistor, one end of the first resistor is connected with a working power supply of the RTC electronic product, the other end of the first resistor is connected with a first input end of the common-cathode double diode, and an output end of the common-cathode double diode is connected with the power-off holding circuit.
The second power supply unit comprises a second resistor and a first diode, one end of the second resistor is connected with a standby power supply of the RTC electronic product, the other end of the second resistor is connected with the input end of the first diode, the output end of the first diode is connected with the second input end of the common-cathode double-diode, and the output end of the common-cathode double-diode is connected with the power-off maintaining circuit.
The power-off holding circuit comprises a third resistor and an electrolytic capacitor, one end of the third resistor is connected with the power supply circuit and the RTC module, the other end of the third resistor is connected with the anode of the electrolytic capacitor, and the cathode of the electrolytic capacitor is grounded.
The RTC module comprises an RTC chip and a filtering unit, and the filtering unit is used for filtering the input voltage of the RTC chip; and a VDD pin of the RTC chip is connected with the filtering unit, the power-off holding circuit and the power supply circuit.
The filtering unit comprises a first filtering capacitor and a second filtering capacitor; one end of the first filter capacitor is connected with a VDD pin of the RTC chip, the power-off holding circuit and the power supply circuit, one end of the second filter capacitor is connected with one end of the first filter capacitor, the VDD pin of the RTC chip, the power-off holding circuit and the power supply circuit, and the first filter capacitor and the second filter capacitor are grounded.
The capacitance value of the electrolytic capacitor is at least 1F.
The model of the RTC chip is PCF 8563T/5.
An RTC electronic product comprising the RTC circuit as described above powered cyclically.
The invention achieves the technical effects that: (1) the standby power supply of the RTC module adopts a super electrolytic capacitor, so that cyclic utilization can be realized, and the service life of the standby power supply is prolonged; (2) the RTC module can still keep normal work after being powered off for many times, thereby ensuring the time synchronism; (3) even under the condition that the electric quantity of the standby power supply is exhausted, when the product is electrified again, the electrolytic capacitor can be charged, and then the standby power supply can still be used after the product is powered off next time.
Compared with the prior art, the RTC circuit and the RTC electronic product with circulating power supply provided by the invention have the advantages that the RTC circuit is arranged in the RTC electronic product and comprises the RTC circuit, a power-off holding circuit and a power supply circuit; when the RTC electronic product is in a normal working state or a standby state, the RTC electronic product supplies power to the RTC circuit through the power supply circuit and charges the power-off holding circuit at the same time; when the RTC electronic product is in a power-off state, the power-off holding circuit supplies power to the RTC circuit. According to the invention, the power-off holding circuit is arranged to charge the RTC electronic product when the RTC electronic product works normally or is in a standby state, and after the RTC electronic product is powered off, the power-off holding circuit supplies power to the RTC circuit, so that the power-off holding circuit can be charged and discharged circularly, and after the RTC electronic product is powered off for multiple times, the RTC circuit can still work normally, thereby ensuring the time synchronism.
Drawings
FIG. 1 is a functional block diagram of an RTC circuit for providing a cyclic power supply according to the present invention;
FIG. 2 is a circuit diagram of an RTC circuit for providing a cyclic power supply according to the present invention.
Detailed Description
In view of the problems in the prior art, the invention provides a RTC circuit and an RTC electronic product with circulating power supply, the RTC electronic product is charged when working normally or in standby by arranging a power-off holding circuit, and after the RTC electronic product is powered off, the power-off holding circuit supplies power to the RTC circuit, so that the power-off holding circuit can charge and discharge circularly, and after the RTC electronic product is powered off for multiple times, the RTC circuit can still work normally, thereby ensuring the time synchronism.
The embodiments of the present invention are intended to explain technical concepts of the present invention, technical problems to be solved, technical features constituting technical solutions, and technical effects to be brought about in more detail. The embodiments are explained below, but the scope of the present invention is not limited thereto. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
In the prior art, a button power supply is used as a standby power supply of an RTC circuit, and when the button battery runs out of power, the real-time clock synchronization function cannot be continuously realized, and the button battery needs to be replaced.
In summary, referring to fig. 1, the present invention provides a RTC circuit with power supplied cyclically, which is disposed in an RTC electronic product and includes an RTC module 100, a power-off holding circuit 200 and a power supply circuit 300; when the RTC electronic product is in a normal working state or a standby state, the RTC electronic product supplies power to the RTC module 100 through the power supply circuit 300, and simultaneously charges the power-off holding circuit 200; when the RTC electronic product is in a power-off state, the RTC module 100 is powered by the power-off holding circuit 200.
In a specific implementation, in this embodiment, the RTC electronic product is an electronic product that needs to implement real-time clock synchronization, and the RTC electronic product includes the RTC circuit that circularly supplies power. When the RTC electronic product is powered on, the RTC electronic product starts to work normally, and at this time, the working power supply of the RTC electronic product generates a voltage of 5V (i.e., a voltage of 5V _ NOR in fig. 1) to the power supply circuit 300, and the RTC module 100 is powered by the power supply circuit 300 to keep real-time clock synchronization; meanwhile, the power-off holding circuit 200 is also charged by the 5V _ NOR voltage, storing the amount of power. When the RTC electronic product enters a standby state, a standby power supply of the RTC electronic product generates a 5V voltage (i.e. 5V _ STB in fig. 1) to the power supply circuit 300, and the RTC module 100 is powered by the power supply circuit 300 to keep real-time clock synchronization; meanwhile, the power-off holding circuit 200 is also charged by the 5V _ STB voltage, and stores the power. When the RTC electronic product is powered off, no voltage is generated in the RTC electronic product, and the power-off holding circuit 200 serves as a standby power supply to supply power to the RTC module 100, so that the RTC module 100 can still work normally, and time synchronization is ensured.
Moreover, when the RTC electronic product is powered on, the power-off holding circuit 200 can be charged again, so that real-time clock synchronization can be continuously realized through the power-off holding circuit 200 after the next time of power-off of the RTC electronic product, and cyclic utilization of a standby power supply (namely, the power-off holding circuit 200) is realized.
Referring to fig. 2, the power supply circuit 300 includes a first power supply unit 301, a second power supply unit 302, and a common-cathode double diode D2; when the RTC electronic product is in a normal operating state, the RTC module 100 is powered and charges the power-off holding circuit 200 through the first power supply unit 301 and the common-cathode dual-diode D2; when the RTC electronic product is in a standby state, the RTC module 100 is powered and charges the power-off holding circuit 200 through the second power supply unit 302 and the common-cathode dual diode D2.
In this embodiment, after the RTC electronic product is powered on, the first power supply unit 301 receives the 5V _ NOR voltage provided by the RTC electronic product, and outputs the voltage to the RTC module 100 and the power-off holding circuit 200 through the first input terminal of the common-cathode dual diode D2 (i.e. the 1 st pin of the common-cathode dual diode D2 in fig. 2), so as to supply power to the RTC module 100 and charge the power-off holding circuit 200. When the RTC electronic product enters the standby state, the second power supply unit 302 receives the 5V _ STB voltage provided by the RTC, and inputs the voltage through the second input terminal of the common-cathode dual diode D2 (i.e., the 2 nd pin of the common-cathode dual diode D2 in fig. 2), and then outputs the voltage to the RTC module 100 and the power-off holding circuit 200, so as to supply power to the RTC module 100 and charge the power-off holding circuit 200. In this embodiment, the power-off keeping circuit 200 can be charged as long as the RTC electronic product is not powered off, so that the power-off keeping circuit 200 is in a state of sufficient electric quantity, and the power-off keeping circuit 200 is ensured to be capable of supplying power to the RTC module 100 after the RTC electronic product is powered off.
Specifically, with reference to fig. 2, the first power supply unit 301 includes a first resistor R1, the second power supply unit 302 includes a second resistor R2 and a first diode D1, the power-off holding circuit 200 includes a third resistor R3 and an electrolytic capacitor CS1, the RTC module 100 includes an RTC chip U1 and a filter unit 101, and the filter unit 101 includes a first filter capacitor C1 and a second filter capacitor C2.
In a specific implementation, in this embodiment, the first resistor R1 is connected to a voltage of 5V _ NOR when the RTC electronic product is operating normally, and outputs the voltage to the first input terminal of the common-cathode dual diode D2, and the output terminal of the common-cathode dual diode D2 is connected to the VDD pin of the RTC chip U1, so as to supply power to the RTC chip U1 and charge the electrolytic capacitor CS 1. When the RTC electronic product enters a standby state, the second resistor R2 is connected to a voltage of 5V _ STB, and is output to the second input terminal of the common-cathode double diode D2 through the first diode D1, and is output from the output terminal of the common-cathode double diode D2 to the VDD pin of the RTC chip U1, so as to supply power to the RTC chip U1 and charge the electrolytic capacitor CS 1. In particular, the first filter capacitor C1 and the second filter capacitor C2 perform filtering processing on the voltage input by the RTC chip U1.
When the RTC electronic product is powered off, the RTC resistor is not powered, and at this time, the electrolytic capacitor CS1 is in a full-power state (for example, in a full-power state, the specific implementation is determined according to a specific charging amount); the third resistor R3 receives the voltage of the electrolytic capacitor CS1, and the voltage is transmitted to the RTC chip U1 to supply power to the RTC chip U1, and the RTC chip U1 is powered to continue real-time clock synchronization. In this embodiment, the electrolytic capacitor CS1 supplies power to the RTC chip U1 after the RTC electronic product is powered off, so that the RTC chip U1 can continue to perform real-time clock synchronization; particularly, the capacitance value of the electrolytic capacitor CS1 is at least 1F, the rated voltage is 5.5V, and the electrolytic capacitor CS can provide power for the RTC chip U1 for a long time; in addition, after the RTC electronic product is electrified, the electrolytic capacitor CS1 can be continuously supplied with power, so that the electrolytic capacitor CS1 can accumulate electric quantity for power supply after the RTC electronic product is powered off next time, the recycling of a standby power supply is realized, and the battery does not need to be replaced.
Specifically, with reference to fig. 2, the connection relationship of the components in the RTC circuit with circulating power supply is as follows: one end of the first resistor R1 is connected to a working power supply of the RTC electronic product, the other end of the first resistor R1 is connected to a first input end of a common-cathode double-diode D2, one end of the second resistor R2 is connected to a standby power supply of the RTC electronic product, the other end of the second resistor R2 is connected to a second input end of the common-cathode double-diode D2, an output end of the common-cathode double-diode D2 is connected to one end of a third resistor R3, a VDD pin of the RTC chip U1, one end of the first filter capacitor C1 and one end of the second filter capacitor C2, the other end of the third resistor R3 is connected to an anode of the electrolytic capacitor CS1, a cathode of the electrolytic capacitor CS1 is grounded, and the other ends of the first filter capacitor C1 and the second filter capacitor C2 are both grounded.
In particular, in this embodiment, the model of the RTC chip U1 is PCF 8563T/5.
The capacitance and the rated voltage of the electrolytic capacitor CS1 can be set according to actual needs; the model of the RTC chip U1 is not limited to PCF8563T/5, and is only used for illustration, and the solution of the present invention can also be used in RTC chips U1 of other models.
In summary, the technical effects achieved by the present invention are: (1) the standby power supply of the RTC module 100 adopts a super electrolytic capacitor CS1, so that cyclic utilization can be realized, and the service life of the standby power supply is prolonged; (2) the RTC module 100 can still keep normal work after multiple power-off, thereby ensuring time synchronism; (3) even in the case of the depletion of the backup power supply, when the product is powered up again, the electrolytic capacitor CS1 can be charged again, so that the backup power supply is still available after the next power failure of the product.
Based on the RTC circuit with the cyclic power supply, the invention further provides an RTC electronic product, which includes the RTC circuit with the cyclic power supply, so that the RTC electronic product can still realize the real-time clock synchronization function after multiple long-time power outages. Since the RTC circuit for the cycle power supply is described in detail above, it is not described here.
In summary, according to the RTC circuit and the RTC electronic product with power cycling provided by the present invention, the RTC circuit is disposed in the RTC electronic product and includes an RTC circuit, a power-off holding circuit and a power supply circuit; when the RTC electronic product is in a normal working state or a standby state, the RTC electronic product supplies power to the RTC circuit through the power supply circuit and charges the power-off holding circuit at the same time; when the RTC electronic product is in a power-off state, the power-off holding circuit supplies power to the RTC circuit. According to the invention, the power-off holding circuit is arranged to charge the RTC electronic product when the RTC electronic product works normally or is in a standby state, and after the RTC electronic product is powered off, the power-off holding circuit supplies power to the RTC circuit, so that the power-off holding circuit can be charged and discharged circularly, and after the RTC electronic product is powered off for multiple times, the RTC circuit can still work normally, thereby ensuring the time synchronism.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A RTC circuit of circulation power supply, set up in RTC electronic product, characterized by that, including RTC module, outage hold circuit and power supply circuit; when the RTC electronic product is in a normal working state or a standby state, the RTC electronic product supplies power to the RTC module through the power supply circuit and charges a power-off holding circuit at the same time; when the RTC electronic product is in a power-off state, the power-off holding circuit supplies power to the RTC module.
2. The cyclically powered RTC circuit of claim 1, wherein the power supply circuit comprises a first power supply unit, a second power supply unit, and a common cathode double diode; when the RTC electronic product is in a normal working state, the first power supply unit and the common cathode double diode are used for supplying power to the RTC module and charging a power-off holding circuit; when the RTC electronic product is in a standby state, the RTC module is powered and charges a power-off holding circuit through the second power supply unit and the common cathode double diode.
3. The RTC circuit of claim 2, wherein the first power supply unit comprises a first resistor, one end of the first resistor is connected to the operating power supply of the RTC electronic product, the other end of the first resistor is connected to a first input terminal of a common-cathode dual-diode, and an output terminal of the common-cathode dual-diode is connected to the power-off holding circuit.
4. The RTC circuit of claim 3, wherein the second power supply unit comprises a second resistor and a first diode, one end of the second resistor is connected to the standby power supply of the RTC electronic product, the other end of the second resistor is connected to the input terminal of the first diode, the output terminal of the first diode is connected to the second input terminal of the common-cathode double-diode, and the output terminal of the common-cathode diode is connected to the power-off holding circuit.
5. The RTC circuit of claim 1, wherein the power down holding circuit comprises a third resistor and an electrolytic capacitor, one end of the third resistor is connected to the power supply circuit and the RTC module, the other end of the third resistor is connected to the anode of the electrolytic capacitor, and the cathode of the electrolytic capacitor is grounded.
6. The cyclically powered RTC circuit of claim 1, wherein the RTC module comprises an RTC chip and a filtering unit, the filtering unit is configured to filter an input voltage of the RTC chip; and a VDD pin of the RTC chip is connected with the filtering unit, the power-off holding circuit and the power supply circuit.
7. The cyclically powered RTC circuit of claim 6, wherein the filtering unit comprises a first filtering capacitor and a second filtering capacitor; one end of the first filter capacitor is connected with a VDD pin of the RTC chip, the power-off holding circuit and the power supply circuit, one end of the second filter capacitor is connected with one end of the first filter capacitor, the VDD pin of the RTC chip, the power-off holding circuit and the power supply circuit, and the first filter capacitor and the second filter capacitor are grounded.
8. The cyclically powered RTC circuit of claim 5, wherein the capacitance of said electrolytic capacitor is at least 1F.
9. The cyclically powered RTC circuit according to claim 6 or 7, wherein the RTC chip has a model of PCF 8563T/5.
10. An RTC electronic product, comprising the RTC circuit for cycle power as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911316209.8A CN111025887A (en) | 2019-12-19 | 2019-12-19 | RTC circuit and RTC electronic product of circulation power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911316209.8A CN111025887A (en) | 2019-12-19 | 2019-12-19 | RTC circuit and RTC electronic product of circulation power supply |
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| Publication Number | Publication Date |
|---|---|
| CN111025887A true CN111025887A (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911316209.8A Pending CN111025887A (en) | 2019-12-19 | 2019-12-19 | RTC circuit and RTC electronic product of circulation power supply |
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| Country | Link |
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| CN (1) | CN111025887A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538370A (en) * | 2020-05-21 | 2020-08-14 | 合肥联宝信息技术有限公司 | Power supply circuit and power supply method for RTC |
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| CN201251801Y (en) * | 2008-09-19 | 2009-06-03 | 合肥进毅智能技术有限公司 | Intelligent withdrawal case with electronic identity card and time recorder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111538370A (en) * | 2020-05-21 | 2020-08-14 | 合肥联宝信息技术有限公司 | Power supply circuit and power supply method for RTC |
| CN111538370B (en) * | 2020-05-21 | 2022-04-08 | 合肥联宝信息技术有限公司 | Power supply circuit and power supply method for RTC |
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