CN204440312U - A kind of RTC feed circuit - Google Patents
A kind of RTC feed circuit Download PDFInfo
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- CN204440312U CN204440312U CN201520148120.6U CN201520148120U CN204440312U CN 204440312 U CN204440312 U CN 204440312U CN 201520148120 U CN201520148120 U CN 201520148120U CN 204440312 U CN204440312 U CN 204440312U
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- rtc
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- feed circuit
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- 238000000034 method Methods 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of RTC feed circuit, in described circuit, the normal electric P5V of system is through resistance R3, R5 dividing potential drop, obtains VCC, connects the energization pins VBAT of south bridge RTC; When the external power supply of disconnection, be that RTC powers by CMOS battery BT1.The utility model design redundant circuit, does not consume CMOS battery electric quantity when system cloud gray model; Improve circuit reliability, arrange between CMOS battery charging zone, only have when battery electric quantity just charges to it lower than during certain value, reduce CMOS cell charging times, extend battery; Improve circuit versatility, and the CMOS method for charging batteries identical with x86 platform product (PC, Notebook) can be realized under Domestic Platform product.
Description
Technical field
The utility model relates to power technique fields, be specifically related to a kind of RTC feed circuit, the RTC(real-time clock controller that a kind of logical device is built) feed circuit, for RTC powers and be the charging of CMOS battery when CMOS battery electric quantity is lower in computer equipment operational process, CMOS battery-powered time and serviceable life can be extended.
Background technology
Computer equipment system time information is mainly stored in (RTC circuit) in South Bridge chip, once the power down of RTC circuit, device systems temporal information is lost, certain applications software service is directly caused to start, affect application software to use, therefore RTC feed circuit are very important in the application of computer equipment.
Current several conventional RTC feed circuit comprise:
1. adopt not chargeable CMOS battery to be that south bridge RTC powers, though this circuit is comparatively conventional, but limit by CMOS battery electric quantity, need periodic replacement;
2. adopt chargeable CMOS battery to be that south bridge RTC powers, existing comparatively simple by circuit design, cause CMOS battery repeatedly to charge, battery is shorter.
Summary of the invention
The technical problems to be solved in the utility model is: extend CMOS serviceable life as far as possible, reduce the charging times of CMOS battery, the present invention is designed with redundant circuit, namely in computer run process, by system power supply, does not need CMOS powered battery; After external power supply disconnects, just by CMOS powered battery, this process is mainly mainboard static state and consumes.
The technical scheme that the utility model adopts is:
A kind of RTC feed circuit, in described circuit, the normal electric P5V of system is through resistance R3, R5 dividing potential drop, obtains VCC, is connected to the energization pins VBAT of south bridge RTC;
When the external power supply of disconnection, be that RTC powers by CMOS battery BT1.
U3, U5 respectively with R7, R8, R10, R11 form 2 comparers, are used for the charging threshold of control CMOS battery, and when CMOS cell voltage is lower than threshold value low spot, U3 exports high level, opens the triode shown in U2, and CMOS battery is charged;
When cell voltage is between threshold value low spot and high point, U1 provides one to keep voltage, makes U2 be in open mode, and CMOS battery last charges;
When cell voltage is higher than threshold value height point, comparer U5 exports high level, opens U4, makes U2 end simultaneously, and charging process terminates.
Described threshold settings is 2.64V-3.19V.
The normal electric P5V of system connects VBAT through the VCC of resistance R3, R5 dividing potential drop by diode D2.
CMOS battery BT1 connects VBAT through diode D3.
The output terminal of triode U2 is that CMOS battery BT1 charges through diode D1.
Described CMOS battery is 330mAh.
The beneficial effects of the utility model are: the utility model design redundant circuit, does not consume CMOS battery electric quantity when system cloud gray model; Improve circuit reliability, arrange between CMOS battery charging zone, only have when battery electric quantity just charges to it lower than during certain value, reduce CMOS cell charging times, extend battery; Improve circuit versatility, and the CMOS method for charging batteries identical with x86 platform product (PC, Notebook) can be realized under Domestic Platform product.
Accompanying drawing explanation
Fig. 1 is RTC circuit working FB(flow block);
Fig. 2 is RTC feed circuit line graphs.
Embodiment
With reference to the accompanying drawings, by embodiment, the utility model is further illustrated:
As shown in Figure 2, a kind of RTC feed circuit, P5V is that system is often electric, the voltage namely just had after system electrification, and VBAT is the energization pins of south bridge RTC, and the fundamental purpose of this circuit is exactly constantly for south bridge RTC provides supply voltage.
When VBAT is lower than 2.5V, the inner RTC clock circuit of south bridge cannot preserve cmos clock information, and system time cannot keep, and therefore need CMOS cell voltage to maintain more than 2.5V during circuit design.
When the system is operated, through R3, R5 electric resistance partial pressure, VCC is set to 3.67V, then cut diode D2 pressure drop (about 0.4v) 3.26V, can be namely that RTC powers by system normal electricity during system cloud gray model.
When the external power supply of disconnection, when namely computer equipment does not rerun, be that RTC powers by CMOS battery BT1.U3, U5 respectively with R7, R8, R10, R11 form 2 comparers, are used for the charging threshold of control CMOS battery, threshold settings is 2.64V-3.19V, and when CMOS cell voltage is lower than 2.64V, U3 exports high level, open the triode shown in U2, CMOS battery is charged; When cell voltage is 2.64V-3.19V, U1 provides one to keep voltage, makes U2 be in open mode, and CMOS battery last charges; When cell voltage is higher than 3.19V, comparer U5 exports high level, opens U4, and make U2 end, charging process terminates simultaneously, and CMOS battery electric quantity reaches 3.19V.
Diode D1, D2, D3 pour in down a chimney mainly for preventing electric current.
The CMOS battery adopted is 330mAh, increases 9.43 times than conventional 35mAh CMOS battery capacity, namely increases 9.43 times service time that can maintain single charge time simultaneously; Known according to CMOS battery discharge characteristic, when battery electric quantity just there will be quick decline lower than electricity during 2.5V, another owing to being provided with between CMOS cell voltage charging zone, therefore single charge can maintain the long period, avoid the charging repeatedly of CMOS battery, reduce the charging times of battery, add the serviceable life of battery, reduce the CMOS battery altering frequency.
Above embodiment is only for illustration of the utility model; and be not limitation of the utility model; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present utility model should be defined by the claims.
Claims (7)
1. RTC feed circuit, is characterized in that: in described circuit, the normal electric P5V of system is through resistance R3, R5 dividing potential drop, obtains VCC, is connected to the energization pins VBAT of south bridge RTC; When the external power supply of disconnection, be that RTC powers by CMOS battery BT1.
2. a kind of RTC feed circuit according to claim 1, it is characterized in that: U3, U5 respectively with R7, R8, R10, R11 form 2 comparers, be used for the charging threshold of control CMOS battery, when CMOS cell voltage is lower than threshold value low spot, U3 exports high level, opens the triode shown in U2, and CMOS battery is charged;
When cell voltage is between threshold value low spot and high point, U1 provides one to keep voltage, makes U2 be in open mode, and CMOS battery last charges;
When cell voltage is higher than threshold value height point, comparer U5 exports high level, opens U4, makes U2 end simultaneously, and charging process terminates.
3. a kind of RTC feed circuit according to claim 2, is characterized in that: described threshold settings is 2.64V-3.19V.
4. a kind of RTC feed circuit according to claim 1,2 or 3, is characterized in that: the normal electric P5V of system connects VBAT through the VCC of resistance R3, R5 dividing potential drop by diode D2.
5. a kind of RTC feed circuit according to claim 1,2 or 3, is characterized in that: CMOS battery BT1 connects VBAT through diode D3.
6. a kind of RTC feed circuit according to claim 1,2 or 3, is characterized in that: the output terminal of triode U2 is that CMOS battery BT1 charges through diode D1.
7. a kind of RTC feed circuit according to claim 1,2 or 3, is characterized in that: described CMOS battery is 330mAh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520148120.6U CN204440312U (en) | 2015-03-17 | 2015-03-17 | A kind of RTC feed circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520148120.6U CN204440312U (en) | 2015-03-17 | 2015-03-17 | A kind of RTC feed circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204440312U true CN204440312U (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520148120.6U Active CN204440312U (en) | 2015-03-17 | 2015-03-17 | A kind of RTC feed circuit |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069860A (en) * | 2017-03-31 | 2017-08-18 | 成都天奥电子股份有限公司 | A kind of energy long-time stable provides the battery of Perfect Time information |
| WO2018161430A1 (en) * | 2017-03-07 | 2018-09-13 | 深圳市大疆创新科技有限公司 | Rtc clock power supply circuit |
-
2015
- 2015-03-17 CN CN201520148120.6U patent/CN204440312U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018161430A1 (en) * | 2017-03-07 | 2018-09-13 | 深圳市大疆创新科技有限公司 | Rtc clock power supply circuit |
| CN109478078A (en) * | 2017-03-07 | 2019-03-15 | 深圳市大疆创新科技有限公司 | RTC clock power supply circuit |
| CN107069860A (en) * | 2017-03-31 | 2017-08-18 | 成都天奥电子股份有限公司 | A kind of energy long-time stable provides the battery of Perfect Time information |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230720 Address after: 250000 building S02, No. 1036, Langchao Road, high tech Zone, Jinan City, Shandong Province Patentee after: Shandong Inspur Scientific Research Institute Co.,Ltd. Address before: No. 1036, Shandong high tech Zone wave road, Ji'nan, Shandong Patentee before: INSPUR GROUP Co.,Ltd. |