CN204613929U - A kind of clock power-down protection circuit and intelligent instrument thereof - Google Patents
A kind of clock power-down protection circuit and intelligent instrument thereof Download PDFInfo
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- CN204613929U CN204613929U CN201520364140.7U CN201520364140U CN204613929U CN 204613929 U CN204613929 U CN 204613929U CN 201520364140 U CN201520364140 U CN 201520364140U CN 204613929 U CN204613929 U CN 204613929U
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Abstract
The utility model provides a kind of clock power-down protection circuit and intelligent instrument thereof, described clock power-down protection circuit comprises: clock chip U4, diode D6, backup battery BT1, resistance R70 and diode D5, the VDD pin of described clock chip U4 is connected to the negative electrode of diode D6, and the anode of described diode D6 is connected to external power supply; The VDD pin of described clock chip U4 is connected to the negative electrode of diode D5, and the anode of described diode D5 is connected to the positive pole of backup battery BT1 by resistance R70, the negative pole of described backup battery BT1 is connected to GVCC.The utility model realizes the power supply of clock chip U4 by the power supply that supplies power with double circuit, the normal work of clock chip U4 all can be ensured when external power supply electrifying and power down, simultaneously, can also prevent external power supply from pouring in down a chimney to backup battery BT1, and then ensure that safety and the serviceable life of backup battery BT1.
Description
Technical field
The utility model relates to a kind of protection circuit, particularly relates to a kind of clock power-down protection circuit, and relates to the intelligent instrument including this clock power-down protection circuit.
Background technology
Since several years in past; technology is fast-developing; and along with the increase of various portable personal communications equipment and domestic electric appliance; people enjoy that cell mobile communication systems brings simultaneously easily; new demand be also been proposed to power down protection, also will ensure safety and the serviceable life of battery simultaneously.
Because intelligent instrument shows its powerful vitality at the very start, become a dominant direction of instrument and meter development at present, its development will produce extremely far-reaching influence to control automatically, electronic technology, defence engineering, spationautics and scientific experimentation etc.; And in the face of the requirement of industrial circle complex environment, be also more and more higher to the demand of power down protection.
Summary of the invention
Technical problem to be solved in the utility model be need to provide that a kind of cost is low, safety and the long clock power-down protection circuit of battery, and provide the intelligent instrument including this clock power-down protection circuit.
To this, the utility model provides a kind of clock power-down protection circuit, comprise: clock chip U4, diode D6, backup battery BT1, resistance R70 and diode D5, the VDD pin of described clock chip U4 is connected to the negative electrode of diode D6, and the anode of described diode D6 is connected to external power supply; The VDD pin of described clock chip U4 is connected to the negative electrode of diode D5, and the anode of described diode D5 is connected to the positive pole of backup battery BT1 by resistance R70, the negative pole of described backup battery BT1 is connected to GVCC.
Described clock chip U4 realizes Power supply by the power supply that supplies power with double circuit, wherein a road power supply is that the VDD pin that external power supply is connected to clock chip U4 by diode D6 when powering is powered, another road is when external power supply power-off, and built-in backup battery BT1 is powered to the VDD pin of clock chip U4 by diode D5; Double loop power supply powers guarantee system in the normal work powered on all can ensure clock chip U4 during power down, and clock chip U4 can normally run; The effect of diode D5 and diode D6 prevents power supply from pouring in down a chimney, and when external power supply is powered, backup battery BT1 does not power, and can not be charged, such benefit can ensure the safety of backup battery BT1, ensure that the long-time use of backup battery BT1, extends its serviceable life; If when external power supply is not powered, automatically switch to backup battery BT1 to power to clock chip U4, and due to the reverse cut-off operation of diode D5, backup battery BT1 powers to the circuit of other parts, ensure that backup battery BT1 powers to clock chip U4 specially when external power down, thus extend the serviceable life of battery.
Further improvement of the utility model is, also comprises electric capacity C13, and the VDD pin of described clock chip U4 is connected to GVCC by electric capacity C13.
Further improvement of the utility model is, also comprises resistance R6, and the SCL pin of described clock chip U4 passes through I
2c clock bus is connected to resistance R6, and described resistance R6 is connected to VCC.
Further improvement of the utility model is, also comprises resistance R7, and the SCA pin of described clock chip U4 passes through I
2c data bus is connected to resistance R7, and described resistance R7 is connected to VCC.
The utility model also provides a kind of intelligent instrument, includes clock power-down protection circuit as above, also comprises key-press module, sampling module, metering module, display module, MCU and power module, and described clock power-down protection circuit passes through I
2c universal serial bus is connected with MCU, and described sampling module is connected to MCU by metering module, and described key-press module, display module are connected with MCU respectively with power module.
Further improvement of the utility model is; described power module is connected with the diode D6 of clock power-down protection circuit; described power module exports the anode of voltage to diode D6 of 5.7V; power module selects the reason of 5.7V voltage to be that the pressure drop of diode forward conducting is about 0.7V; 5.7V power supply becomes clock 5.0V after the diode drop of 0.7V; be consistent with the 5V electric power system of MCU and without the need to level conversion, simplify circuit structure.
Further improvement of the utility model is, also comprises memory module, and described memory module is connected with MCU.
Further improvement of the utility model is, also comprises 485 communication modules, and described 485 communication modules are connected with MCU.
Further improvement of the utility model is, also comprises level shifting circuit, and described level shifting circuit is connected with MCU.
Further improvement of the utility model is, also comprises wireless communication module, and the UART serial ports of described wireless communication module is connected to MCU by level shifting circuit.
Compared with prior art, the beneficial effects of the utility model are: the power supply being realized clock chip U4 by the power supply that supplies power with double circuit, the normal work of clock chip U4 all can be ensured when external power supply electrifying and power down, simultaneously, can also prevent external power supply from pouring in down a chimney to backup battery BT1, namely when external Power supply, backup battery BT1 does not power, and can not be charged, and then ensure that safety and the serviceable life of backup battery BT1; On this basis, additionally provide the intelligent instrument comprising this clock power-down protection circuit, this intelligent instrument can comprise the functions such as storage, 485 communications and wireless telecommunications further.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model embodiment 1;
Fig. 2 is the modular structure schematic diagram of the utility model embodiment 2;
Fig. 3 is the electrical block diagram of the wireless communication module of the utility model embodiment 2;
Fig. 4 is the circuit theory diagrams of the first level conversion unit of the level shifting circuit of the utility model embodiment 2;
Fig. 5 is the circuit theory diagrams of the second electrical level converting unit of the level shifting circuit of the utility model embodiment 2;
Fig. 6 is the circuit theory diagrams of the three level converting unit of the level shifting circuit of the utility model embodiment 2;
Fig. 7 is the circuit theory diagrams of the 4th level conversion unit of the level shifting circuit of the utility model embodiment 2;
Fig. 8 is the circuit theory diagrams of the 5th level conversion unit of the level shifting circuit of the utility model embodiment 2.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present utility model is described in further detail.
Embodiment 1:
As shown in Figure 1, this example provides a kind of clock power-down protection circuit, comprise: clock chip U4, diode D6, backup battery BT1, resistance R70 and diode D5, the VDD pin of described clock chip U4 is connected to the negative electrode of diode D6, and the anode of described diode D6 is connected to external power supply; The VDD pin of described clock chip U4 is connected to the negative electrode of diode D5, and the anode of described diode D5 is connected to the positive pole of backup battery BT1 by resistance R70, the negative pole of described backup battery BT1 is connected to GVCC.
Described clock chip U4 realizes Power supply by the power supply that supplies power with double circuit, wherein a road power supply is that external power supply is depressurized to by diode D6 when powering and powers to the VDD pin of clock chip U4, another road is when external power supply power-off, and built-in backup battery BT1 is powered to the VDD pin of clock chip U4 by diode D5, double loop power supply powers guarantee system in the normal work powered on all can ensure clock chip U4 during power down, and clock chip U4 can normally run, the effect of diode D5 and diode D6 prevents power supply from pouring in down a chimney, when external power supply is powered, backup battery BT1 does not power, and can not be charged, such benefit can ensure the safety of backup battery BT1, ensure that the long-time use of backup battery BT1, extend its serviceable life, if when external power supply is not powered, automatically switch to backup battery BT1 to power to clock chip U4, and due to the reverse cut-off operation of diode D5, backup battery BT1 powers to the circuit of other parts, ensure that backup battery BT1 powers to clock chip U4 specially when external power down, thus extend the serviceable life of battery.
As shown in Figure 1, this example also comprises electric capacity C13, resistance R6 and resistance R7, and the VDD pin of described clock chip U4 is connected to GVCC by electric capacity C13; The SCL pin of described clock chip U4 passes through I
2c clock bus is connected to resistance R6, and described resistance R6 is connected to VCC; The SCA pin of described clock chip U4 passes through I
2c data bus is connected to resistance R7, and described resistance R7 is connected to VCC.
Embodiment 2:
As shown in Figure 2; this example also provides a kind of intelligent instrument; include clock power-down protection circuit as described in Example 1; also comprise key-press module, sampling module, metering module, display module, MCU, power module, memory module, 485 communication modules, wireless communication module and level shifting circuit, described clock power-down protection circuit passes through I
2c universal serial bus is connected with MCU, and described sampling module is connected to MCU by metering module, and described key-press module, display module, power module, memory module are connected with MCU respectively with 485 communication modules; The UART serial ports of described wireless communication module is connected to MCU by level shifting circuit; Described level shifting circuit is connected with MCU with wireless communication module respectively; Wherein, as shown in Figure 3, in Fig. 3, U5 is integrated wireless telecommunications transceiver module to the electrical block diagram of described wireless communication module, and its SLP pin is sleep control port, and CFG pin is configuration control port, and RST is reseting port; The electrical block diagram of described level shifting circuit is as shown in Fig. 4 to Fig. 8.
Shown in Fig. 4 to Fig. 8 is the circuit theory diagrams of level shifting circuit between wireless communication module and MCU connectivity port, by this level shifting circuit, the level conversion between the 5V electric power system of MCU and the 3.3V electric power system of wireless communication module can be realized, realize MCU to the communication of wireless communication module and control; As shown in Figure 4, described level shifting circuit comprises the first level conversion unit, described first level conversion unit comprises resistance R9, triode Q3 and resistance R10, for providing the level after conversion to the sleep control port of wireless communication module, i.e. and the power supply of 3.3V; As shown in Figure 5, described level shifting circuit comprises second electrical level converting unit, described second electrical level converting unit comprises resistance R12, triode Q4 and resistance R13, for providing the level after conversion to the configuration control port of wireless communication module, i.e. and the power supply of 3.3V; As shown in Figure 6, described level shifting circuit comprises three level converting unit, described three level converting unit comprises resistance R16, triode Q5, resistance R17 and electric capacity C18, for providing the level after conversion to the reseting port of wireless telecommunications transceiver module U5, i.e. and the power supply of 3.3V; As shown in Figure 7, described level shifting circuit comprises the 4th level conversion unit, and described 4th level conversion unit comprises resistance R35, triode Q6 and resistance R36, and the RX serial ports for the RX1 pin to wireless communication module provides the level after conversion; As shown in Figure 8, described level shifting circuit comprises the 5th level conversion unit, and described 5th level conversion unit comprises resistance R37, triode Q7 and resistance R38, and the TX serial ports for the TX1 pin to wireless communication module provides the level after conversion.
This routine described power module is connected with the diode D6 of clock power-down protection circuit, and described power module exports the anode of voltage to diode D6 of 5.7V; Described clock chip U4 passes through I
2c universal serial bus and MCU communication, wherein, the I2CSCK1 in Fig. 1 is I
2c clock bus, I2CSDA1 is I
2c data bus, clock chip U4 realizes Power supply by the power supply that supplies power with double circuit, and a road+5.7V power supply is that intelligent electric meter external AC power supply exports 5.7V voltage by power module when powering, and is then depressurized to 5.0V by diode D6 and powers to clock chip U4; Another road is when external AC power supply power-off, and built-in clock backup battery BT1 is powered to clock chip U4 by diode D5; Double loop power supply powers guarantee system in the normal work and the normally operation that power on all can ensure clock chip U4 during power down, the effect of diode D5 and diode D6 prevents power supply from pouring in down a chimney, during external AC power supply, backup battery BT1 does not power, and can not be charged, such benefit can ensure the safety of backup battery BT1 and the long-time use of backup battery BT1.
This example, can integrated digital integrated circuit and then measure various electrical quantity directly and accurately by sampling module and metering module, and adopts MCU to pass through to read and show electrical quantity data, realizes various observing and controlling function; The level conversion demand of wireless communication module is met by level shifting circuit, realize the level conversion between MCU power demands and wireless communication module power demands, and then realize the wireless reading of data, on this basis, by the setting of memory module, data storage function can be realized when communication process occurs abnormal, such as, under the analogue such as communication line disconnection or upper Host Shutdown, data in exception procedure are stored in a storage module, is unlikely to obliterated data.
This example also preferably includes clock module and 485 communication modules, and described clock module is connected with MCU respectively with 485 communication modules.This example is by the setting of memory module and clock module, data readback function can be realized when communication process occurs abnormal, such as, under the analogue such as communication line disconnection or upper Host Shutdown, data in exception procedure are stored in a storage module, described clock module calibrates current time by MCU, described MCU can carry out the data-frozen of timing according to current time and the time interval set, and the data freezed and freeze-off time thereof are stored into memory module from metering module and clock module, and then prevent loss of data, and timing back read data can be set to reduce read-write number of times.
This example is on the basis achieving wireless communication module, also comprise 485 communication modules, when industrial environment is severe, such as when wireless signal cannot penetrate or wireless signal instability, wired data transmission can be realized by 485 communication modules, and then ensure fluency and the stability of data transmission on both side; Meanwhile, increase by 485 communication modules, be also conducive to the test of intelligent wireless instrument.
The embodiment of the above is better embodiment of the present utility model; not limit concrete practical range of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment, and the equivalence change that all shapes according to the utility model, structure are done is all in protection domain of the present utility model.
Claims (10)
1. a clock power-down protection circuit, it is characterized in that, comprise: clock chip U4, diode D6, backup battery BT1, resistance R70 and diode D5, the VDD pin of described clock chip U4 is connected to the negative electrode of diode D6, and the anode of described diode D6 is connected to external power supply; The VDD pin of described clock chip U4 is connected to the negative electrode of diode D5, and the anode of described diode D5 is connected to the positive pole of backup battery BT1 by resistance R70, the negative pole of described backup battery BT1 is connected to GVCC.
2. clock power-down protection circuit according to claim 1, is characterized in that, also comprises electric capacity C13, and the VDD pin of described clock chip U4 is connected to GVCC by electric capacity C13.
3. clock power-down protection circuit according to claim 1 and 2, is characterized in that, also comprises resistance R6, and the SCL pin of described clock chip U4 passes through I
2c clock bus is connected to resistance R6, and described resistance R6 is connected to VCC.
4. clock power-down protection circuit according to claim 1 and 2, is characterized in that, also comprises resistance R7, and the SCA pin of described clock chip U4 passes through I
2c data bus is connected to resistance R7, and described resistance R7 is connected to VCC.
5. an intelligent instrument; it is characterized in that; include the clock power-down protection circuit as described in Claims 1-4 any one, also comprise key-press module, sampling module, metering module, display module, MCU and power module, described clock power-down protection circuit passes through I
2c universal serial bus is connected with MCU, and described sampling module is connected to MCU by metering module, and described key-press module, display module are connected with MCU respectively with power module.
6. intelligent instrument according to claim 5, is characterized in that, described power module is connected with the diode D6 of clock power-down protection circuit, and described power module exports the anode of voltage to diode D6 of 5.7V.
7. intelligent instrument according to claim 5, is characterized in that, also comprises memory module, and described memory module is connected with MCU.
8. intelligent instrument according to claim 5, is characterized in that, also comprises 485 communication modules, and described 485 communication modules are connected with MCU.
9. intelligent instrument according to claim 5, is characterized in that, also comprises level shifting circuit, and described level shifting circuit is connected with MCU.
10. intelligent instrument according to claim 9, is characterized in that, also comprises wireless communication module, and the UART serial ports of described wireless communication module is connected to MCU by level shifting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520364140.7U CN204613929U (en) | 2015-05-29 | 2015-05-29 | A kind of clock power-down protection circuit and intelligent instrument thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520364140.7U CN204613929U (en) | 2015-05-29 | 2015-05-29 | A kind of clock power-down protection circuit and intelligent instrument thereof |
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| CN204613929U true CN204613929U (en) | 2015-09-02 |
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| CN201520364140.7U Expired - Fee Related CN204613929U (en) | 2015-05-29 | 2015-05-29 | A kind of clock power-down protection circuit and intelligent instrument thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302269A (en) * | 2015-11-30 | 2016-02-03 | 北京机械设备研究所 | Power failure detection and data storage circuit for microcomputer system |
| CN107887972A (en) * | 2017-12-20 | 2018-04-06 | 宁波三星医疗电气股份有限公司 | The method of supplying power to and electric power system of a kind of power concentrator |
| CN108110836A (en) * | 2017-12-27 | 2018-06-01 | 浙江恒业电子有限公司 | A kind of battery protecting circuit, battery case and electric energy meter |
-
2015
- 2015-05-29 CN CN201520364140.7U patent/CN204613929U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302269A (en) * | 2015-11-30 | 2016-02-03 | 北京机械设备研究所 | Power failure detection and data storage circuit for microcomputer system |
| CN107887972A (en) * | 2017-12-20 | 2018-04-06 | 宁波三星医疗电气股份有限公司 | The method of supplying power to and electric power system of a kind of power concentrator |
| CN108110836A (en) * | 2017-12-27 | 2018-06-01 | 浙江恒业电子有限公司 | A kind of battery protecting circuit, battery case and electric energy meter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150902 Termination date: 20200529 |