CN105955009B - Power supply circuit of real-time clock and intelligent bracelet - Google Patents
Power supply circuit of real-time clock and intelligent bracelet Download PDFInfo
- Publication number
- CN105955009B CN105955009B CN201610270633.3A CN201610270633A CN105955009B CN 105955009 B CN105955009 B CN 105955009B CN 201610270633 A CN201610270633 A CN 201610270633A CN 105955009 B CN105955009 B CN 105955009B
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- power supply
- real
- time clock
- circuit
- battery
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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
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
- A44C5/0007—Bracelets specially adapted for other functions or with means for attaching other articles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention belongs to the technical field of intelligent terminals, and particularly relates to a power supply circuit of a real-time clock and an intelligent bracelet. In the embodiment of the invention, the power supply circuit of the real-time clock respectively comprises a first power supply branch and a second power supply branch for supplying power to the real-time clock chip, the first power supply branch is the anode of the lithium battery, a voltage division circuit and the real-time clock chip which are sequentially connected, the second power supply branch is the anode of the lithium battery, a voltage reduction circuit and the real-time clock chip which are sequentially connected, the battery protection circuit detects that the output of the lithium battery is under-voltage, the second power supply branch is powered off, the first power supply branch is kept on, the real-time clock chip cannot stop working due to power off, and the time is ensured not to be lost.
Description
Technical Field
the invention belongs to the technical field of intelligent terminals, and particularly relates to a power supply circuit of a real-time clock and an intelligent bracelet.
Background
the power supply of the real-time clock of the existing intelligent bracelet has two modes, one mode is that the real-time clock shares a battery with other circuits of the intelligent bracelet, and the battery protection is carried out on the sharing. When battery voltage is lower than 3V, battery protection circuit enable end OD output low level makes MOS disconnection battery ground and the connection of master control ground to the mainboard 3.3V's of disconnected intelligent bracelet power supply, under this condition. In the time of intelligence bracelet outage, the real-time clock of intelligence bracelet can not keep time, when the 3.3V of main control board was powered on once more, the time of intelligence bracelet will reset to the default, rather than current time.
In order to ensure that the time of the real-time clock is not lost in the power-off period of the intelligent bracelet, an independent button cell is adopted to supply power to the real-time clock of the bracelet, and other circuits of the intelligent bracelet are supplied with power by another lithium battery. Therefore, the time of the real-time clock can be continuously kept when the lithium battery of the intelligent bracelet is lower than 3V, namely, the voltage of other circuits is disconnected by 3.3V. But need add a button cell, increased the volume and the cost of intelligent bracelet.
Disclosure of Invention
The embodiment of the invention aims to provide a power supply circuit of a real-time clock, and aims to solve the problem that the size and the cost of an intelligent bracelet must be increased in order to avoid the uninterrupted power supply of the real-time clock of the intelligent bracelet.
the embodiment of the invention is realized in such a way that the power supply circuit of the real-time clock comprises a lithium battery and a real-time clock chip, and the power supply circuit of the real-time clock further comprises:
The voltage-dividing circuit, the voltage-reducing circuit, the battery protection circuit and the double MOS tube are connected in series;
the power supply circuit of the real-time clock comprises a first power supply branch and a second power supply branch, the first power supply branch is an anode of the lithium battery, a voltage division circuit and a real-time clock chip which are connected in sequence, and the second power supply branch is an anode of the lithium battery, a voltage reduction circuit and a real-time clock chip which are connected in sequence;
The detection end of the battery protection circuit is connected with the anode of the lithium battery, the execution end of the battery protection circuit is connected with the driving end of the double MOS tube, two ends of the double MOS tube are respectively connected with the battery ground and the master control ground of the lithium battery, the battery protection circuit detects that the output of the lithium battery is under-voltage, the double MOS tube is controlled to cut off the loop of the battery ground and the master control ground, the second power supply branch is powered off, and the first power supply branch is kept conducted.
In the above structure, the power supply circuit of the real-time clock further includes:
And the diode is connected between the anode of the lithium battery and the detection end of the battery protection circuit.
In the above structure, the battery protection circuit employs a battery protection chip U1, the detection terminal CSI of the battery protection chip U1 is connected to the positive electrode of the lithium battery through the diode, and the charge protection execution terminal OD and the discharge protection execution terminal OC of the battery protection chip U1 are respectively connected to the two driving terminals of the dual MOS transistor.
another object of an embodiment of the present invention is to provide an intelligent bracelet, including a power supply circuit of a real-time clock, where the power supply circuit of the real-time clock includes a lithium battery and a real-time clock chip, and the power supply circuit of the real-time clock further includes:
the voltage-dividing circuit, the voltage-reducing circuit, the battery protection circuit and the double MOS tube are connected in series;
the power supply circuit of the real-time clock comprises a first power supply branch and a second power supply branch, the first power supply branch is an anode of the lithium battery, a voltage division circuit and a real-time clock chip which are connected in sequence, and the second power supply branch is an anode of the lithium battery, a voltage reduction circuit and a real-time clock chip which are connected in sequence;
the detection end of the battery protection circuit is connected with the anode of the lithium battery, the execution end of the battery protection circuit is connected with the driving end of the double MOS tube, two ends of the double MOS tube are respectively connected with the battery ground and the master control ground of the lithium battery, the battery protection circuit detects that the output of the lithium battery is under-voltage, the double MOS tube is controlled to cut off the loop of the battery ground and the master control ground, the second power supply branch is powered off, and the first power supply branch is kept conducted.
In the above structure, the power supply circuit of the real-time clock further includes:
and the diode is connected between the anode of the lithium battery and the detection end of the battery protection circuit.
in the above structure, the battery protection circuit employs a battery protection chip U1, the detection terminal CSI of the battery protection chip U1 is connected to the positive electrode of the lithium battery through the diode, and the charge protection execution terminal OD and the discharge protection execution terminal OC of the battery protection chip U1 are respectively connected to the two driving terminals of the dual MOS transistor.
In the embodiment of the invention, the power supply circuit of the real-time clock respectively comprises a first power supply branch and a second power supply branch for supplying power to the real-time clock chip, the first power supply branch is the anode of the lithium battery, a voltage division circuit and the real-time clock chip which are sequentially connected, the second power supply branch is the anode of the lithium battery, a voltage reduction circuit and the real-time clock chip which are sequentially connected, the battery protection circuit detects that the output of the lithium battery is under-voltage, the second power supply branch is powered off, the first power supply branch is kept on, the real-time clock chip cannot stop working due to power off, and the time is ensured not to be lost.
Drawings
Fig. 1 is a circuit configuration diagram of a power supply circuit of a real-time clock according to a first embodiment of the present invention;
Fig. 2 is a circuit configuration diagram of a power supply circuit of a real-time clock according to a second embodiment of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention and are not intended to limit the invention.
Fig. 1 shows a circuit configuration of a power supply circuit of a real-time clock according to a first embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown.
a power supply circuit of a real-time clock comprises a lithium battery 1 and a real-time clock chip 2, and further comprises:
the voltage divider circuit 3, the voltage reduction circuit 4, the battery protection circuit 5 and the double MOS tube 6;
The power supply circuit of the real-time clock comprises a first power supply branch and a second power supply branch, wherein the first power supply branch is a positive electrode of the lithium battery 1, a voltage division circuit 3 and a real-time clock chip 2 which are connected in sequence, and the second power supply branch is a positive electrode of the lithium battery 1, a voltage reduction circuit 4 and a real-time clock chip 2 which are connected in sequence; and the second power supply branch also supplies power to other functional circuits at the same time.
The detection end of the battery protection circuit 5 is connected with the anode of the lithium battery 1, the execution end of the battery protection circuit 5 is connected with the driving end of the double MOS tube 6, two ends of the double MOS tube 6 are respectively connected with the battery ground and the master control ground of the lithium battery 1, the battery protection circuit 5 detects that the lithium battery 1 outputs under-voltage, the double MOS tube 6 is controlled to cut off a loop of the battery ground and the master control ground, the second power supply branch is powered off, and the first power supply branch is kept conducted.
Like this because of lithium cell 1 output is undervoltage, the second power supply branch is cut off, and first power supply branch keeps switching on, and real-time clock chip 2 is direct by lithium cell 1 power supply, even consequently other functional circuit outage, real-time clock chip 2 also can not be because of outage stop work, and the guarantee time does not lose.
Fig. 2 shows a circuit configuration of a power supply circuit of a real-time clock according to a second embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown.
As an embodiment of the present invention, the power supply circuit of the real-time clock further includes:
and the diode 7 is connected between the positive electrode of the lithium battery 1 and the detection end of the battery protection circuit 5.
As an embodiment of the present invention, the battery protection circuit 5 employs a battery protection chip U1, the detection terminal CSI of the battery protection chip U1 is connected to the anode of the lithium battery 1 through the diode 7, and the charge protection execution terminal OD and the discharge protection execution terminal OC of the battery protection chip U1 are respectively connected to two driving terminals of the dual MOS transistor 6.
as shown in fig. 1, an embodiment of the present invention further provides an intelligent bracelet, including a power supply circuit of a real-time clock, where the power supply circuit of the real-time clock includes a lithium battery 1 and a real-time clock chip 2, and the power supply circuit of the real-time clock further includes:
The voltage divider circuit 3, the voltage reduction circuit 4, the battery protection circuit 5 and the double MOS tube 6;
The power supply circuit of the real-time clock comprises a first power supply branch and a second power supply branch, wherein the first power supply branch is a positive electrode of the lithium battery 1, a voltage division circuit 3 and a real-time clock chip 2 which are connected in sequence, and the second power supply branch is a positive electrode of the lithium battery 1, a voltage reduction circuit 4 and a real-time clock chip 2 which are connected in sequence;
The detection end of the battery protection circuit 5 is connected with the anode of the lithium battery 1, the execution end of the battery protection circuit 5 is connected with the driving end of the double MOS tube 6, two ends of the double MOS tube 6 are respectively connected with the battery ground and the master control ground of the lithium battery 1, the battery protection circuit 5 detects that the lithium battery 1 outputs under-voltage, the double MOS tube 6 is controlled to cut off a loop of the battery ground and the master control ground, the second power supply branch is powered off, and the first power supply branch is kept conducted.
As shown in fig. 2, as an embodiment of the present invention, the power supply circuit of the real-time clock further includes:
And the diode 7 is connected between the positive electrode of the lithium battery 1 and the detection end of the battery protection circuit 5.
As an embodiment of the present invention, the battery protection circuit 5 employs a battery protection chip U1, the detection terminal CSI of the battery protection chip U1 is connected to the anode of the lithium battery 1 through the diode 7, and the charge protection execution terminal OD and the discharge protection execution terminal OC of the battery protection chip U1 are respectively connected to two driving terminals of the dual MOS transistor 6.
the working principle of the power supply circuit of the real-time clock is illustrated as follows:
according to the scheme, a lithium battery 1 is adopted for supplying power, a real-time clock chip 2 is supplied with power by two power supply branches, one power is directly supplied to the real-time clock chip 2 through a voltage division circuit 3 by the voltage of the lithium battery 1, the other power is supplied to the real-time clock chip 2 after the voltage of the lithium battery 1 is reduced to 3.3V through a voltage reduction circuit 4, when the voltage of the lithium battery 1 is higher than 3.6V, the lithium battery 1 can normally supply voltage to the voltage reduction circuit 4, so that the voltage reduction circuit 4 can output normal 3.3V, at the moment, the real-time clock chip 2 and all other circuits of a mainboard adopt 3.3V power supply, and an intelligent; when the voltage of the lithium battery 1 is reduced to 3.6V, because the voltage drop exists in the diode 7, the input voltage detected by the battery protection circuit 5 is 3V, the undervoltage level of the battery protection chip is just reached, and the battery protection circuit 5 outputs a low level. Therefore, a loop between the master control ground of the double mos tube 5 and the battery ground is disconnected, the lithium battery 1 does not discharge electricity to the smart band any more, and other functional circuits of the smart band mainboard stop working at the moment; and the real-time clock chip 2 detects that the 3.3V input pin is lower than 1.2V, and automatically switches to the voltage power supply directly provided by the lithium battery 1, because the power consumption of the real-time clock chip 2 adopted by people is very low, even if the residual electricity quantity of the lithium battery 1 is small, the real-time clock chip 2 can be ensured not to be lost for a long time.
In the embodiment of the invention, the power supply circuit of the real-time clock respectively comprises a first power supply branch and a second power supply branch for supplying power to the real-time clock chip, the first power supply branch is the anode of the lithium battery, a voltage division circuit and the real-time clock chip which are sequentially connected, the second power supply branch is the anode of the lithium battery, a voltage reduction circuit and the real-time clock chip which are sequentially connected, the battery protection circuit detects that the output of the lithium battery is under-voltage, the second power supply branch is powered off, the first power supply branch is kept on, the real-time clock chip cannot stop working due to power off, and the time is ensured not to be lost.
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. The utility model provides a power supply circuit of real-time clock, power supply circuit of real-time clock includes lithium cell and real-time clock chip, its characterized in that, power supply circuit of real-time clock still includes:
the voltage-dividing circuit, the voltage-reducing circuit, the battery protection circuit and the double MOS tube are connected in series;
the power supply circuit of the real-time clock comprises a first power supply branch and a second power supply branch, the first power supply branch is an anode of the lithium battery, a voltage division circuit and a real-time clock chip which are sequentially connected, the second power supply branch is an anode of the lithium battery, a voltage reduction circuit and a real-time clock chip which are sequentially connected, and power can be supplied to the real-time clock chip through the first power supply branch and the second power supply branch simultaneously;
the detection end of the battery protection circuit is connected with the anode of the lithium battery, the execution end of the battery protection circuit is connected with the driving end of the double MOS tube, two ends of the double MOS tube are respectively connected with the battery ground and the master control ground of the lithium battery, the battery protection circuit detects that the output of the lithium battery is under-voltage, the double MOS tube is controlled to cut off the loops of the battery ground and the master control ground, the second power supply branch is powered off, and the first power supply branch is kept on to prevent time loss;
The power supply circuit of the real-time clock further comprises:
the diode is connected between the anode of the lithium battery and the detection end of the battery protection circuit;
The battery protection circuit adopts a battery protection chip U1, a detection end CSI of the battery protection chip U1 is connected with the anode of the lithium battery through the diode, and a charging protection execution end OD and a discharging protection execution end OC of the battery protection chip U1 are respectively connected with two driving ends of the double MOS tube.
2. The utility model provides an intelligent bracelet, includes real-time clock's supply circuit, real-time clock's supply circuit includes lithium cell and real-time clock chip, its characterized in that, real-time clock's supply circuit still includes:
the voltage-dividing circuit, the voltage-reducing circuit, the battery protection circuit and the double MOS tube are connected in series;
The power supply circuit of the real-time clock comprises a first power supply branch and a second power supply branch, the first power supply branch is an anode of the lithium battery, a voltage division circuit and a real-time clock chip which are sequentially connected, the second power supply branch is an anode of the lithium battery, a voltage reduction circuit and a real-time clock chip which are sequentially connected, and power can be supplied to the real-time clock chip through the first power supply branch and the second power supply branch simultaneously;
the detection end of the battery protection circuit is connected with the anode of the lithium battery, the execution end of the battery protection circuit is connected with the driving end of the double MOS tube, two ends of the double MOS tube are respectively connected with the battery ground and the master control ground of the lithium battery, the battery protection circuit detects that the output of the lithium battery is under-voltage, the double MOS tube is controlled to cut off the loops of the battery ground and the master control ground, the second power supply branch is powered off, and the first power supply branch is kept on to prevent time loss;
the power supply circuit of the real-time clock further comprises:
The diode is connected between the anode of the lithium battery and the detection end of the battery protection circuit;
The battery protection circuit adopts a battery protection chip U1, a detection end CSI of the battery protection chip U1 is connected with the anode of the lithium battery through the diode, and a charging protection execution end OD and a discharging protection execution end OC of the battery protection chip U1 are respectively connected with two driving ends of the double MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610270633.3A CN105955009B (en) | 2016-04-27 | 2016-04-27 | Power supply circuit of real-time clock and intelligent bracelet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610270633.3A CN105955009B (en) | 2016-04-27 | 2016-04-27 | Power supply circuit of real-time clock and intelligent bracelet |
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| Publication Number | Publication Date |
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| CN105955009A CN105955009A (en) | 2016-09-21 |
| CN105955009B true CN105955009B (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610270633.3A Active CN105955009B (en) | 2016-04-27 | 2016-04-27 | Power supply circuit of real-time clock and intelligent bracelet |
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| CN (1) | CN105955009B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106805384A (en) * | 2017-03-08 | 2017-06-09 | 南京信息工程大学 | A kind of new weather monitoring Intelligent bracelet |
| CN111025887A (en) * | 2019-12-19 | 2020-04-17 | 深圳市创维群欣安防科技股份有限公司 | RTC circuit and RTC electronic product of circulation power supply |
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| JP2004319104A (en) * | 2003-04-11 | 2004-11-11 | Seiko Instruments Inc | Battery pack with residual battery capacity calculating function |
| JP2009037456A (en) * | 2007-08-02 | 2009-02-19 | Nec Electronics Corp | Micro-controller and its control method |
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| CN200947549Y (en) * | 2006-09-07 | 2007-09-12 | 安凯（广州）软件技术有限公司 | Power supply circuit of double voltage source real-time clock circuit |
| JP2013008167A (en) * | 2011-06-24 | 2013-01-10 | Lenovo Singapore Pte Ltd | Electric power system of mobile type electronic apparatus having timer circuit |
| CN202856392U (en) * | 2012-08-28 | 2013-04-03 | 柳州市海格电气有限公司 | Uninterrupted power supply |
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| CN105955009A (en) | 2016-09-21 |
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Effective date of registration: 20190417 Address after: 518000 Guangdong province Shenzhen Longgang District Bantian Street five and Avenue North 4012 Yuan Zheng Industrial Park. Applicant after: Yuanzheng Science and Technology Co., Ltd., Shenzhen City Address before: 518000 Shenzhen, Guangdong province Longgang District ban Xue Gang Industrial Zone five and Avenue North Yuan Zheng Industrial Park. Applicant before: HESVIT HEALTH TECH CO., LTD. |
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