CN101719689A - Dual power supply switching circuit for electronic electric energy meter - Google Patents
Dual power supply switching circuit for electronic electric energy meter Download PDFInfo
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- CN101719689A CN101719689A CN200910263829A CN200910263829A CN101719689A CN 101719689 A CN101719689 A CN 101719689A CN 200910263829 A CN200910263829 A CN 200910263829A CN 200910263829 A CN200910263829 A CN 200910263829A CN 101719689 A CN101719689 A CN 101719689A
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Abstract
The invention discloses a dual power supply switching circuit for an electronic electric energy meter, which comprises a main power supply, a battery used as an auxiliary power supply, a main power supply failure detecting module, an electronic switch and a diode, wherein the diode is used for preventing the main power supply and the auxiliary power supply from mutually charging current inversely; the electronic switch is connected with the output end of the battery and is used for directly outputting the auxiliary power supply when the main power supply fails; the diode is connected with the main power supply in series and is used for preventing the auxiliary power supply from charging the current reversely to the main power supply; and the main power supply failure detecting module is used for controlling the action of the electronic switch, and when the main power supply failure detecting module detects that the voltage of the main power supply is lower than the threshold value, the signal is immediately transmitted to the electronic switch to conduct the electronic switch to output the auxiliary power supply. The circuit of the invention can quickly supply the auxiliary power supply for the loop when the voltage of the main power supply is lower than the threshold value, has very short switching time, does not need CPU intervention, has no action of machinery such as a relay and the like, completes all actions from beginning to end without stopping, has high reliability, and ensures the continuity and the stability of the subsequent load power supply.
Description
Technical field
The present invention relates to a kind of dual power supply switching circuit that is used for electronic electric energy meter, belong to the low voltage electrical apparatus technology field.
Background technology
Now the electronic electric energy meter of Shi Yonging all has second current supply circuit of battery as ammeter for realizing the power failure meter-reading function in table.Having under the civil power situation, ammeter is from external electricity, to guarantee battery electric quantity.And when outage ammeter switch to powered battery, enter the low power operation pattern simultaneously, in order to response user's the power failure demand of checking meter.The ammeter solution is to utilize CPU to detect the externally fed situation mostly at present, must make response immediately by CPU in case trigger power cut-off incident, and control powered battery circuit switching makes system switch to the powered battery state.Because need go through outage detection, respond, send a series of observing and controlling flow processs such as control signal and execution, make that this scheme relative complex, reliability are difficult to improve.
Summary of the invention
The object of the present invention is to provide a kind of switching time extremely short and reliability is high, be used for the dual power supply switching circuit of electronic electric energy meter.
This dual power supply switching circuit that is used for electronic electric energy meter provided by the invention, comprise main power source, battery as auxiliary power, main power source detection of power loss module, it is characterized in that also comprising an electronic switch, one is used to prevent main, the diode of the mutually reciprocal filling electric current of auxiliary power, described electronic switch is connected with the battery output, be used for when the main power source power down, directly auxiliary power being exported, described diode is connected with main power source, be used to block the reverse filling of auxiliary power to main power source, main power source detection of power loss module detects main power source at the diode anode end, and give electronic switch with detection signal, the conducting immediately when main power voltage is lower than threshold values of control electronic switch, the output auxiliary power.
The output of described diode also is connected with the DC/DC voltage stabilizing circuit, is used to provide the power supply output loading required all size voltage.Described electronic switch is made up of metal-oxide-semiconductor.Described main power source is the 4-6 volt, and auxiliary power adopts 6 volts of lithium batteries of forming.
Because the present invention has adopted electronic switch to switch the major-minor power supply, circuit detects the main power source electric power thus supplied voluntarily, when the detection of power loss module detects main current supply circuit voltage and is lower than certain threshold values, electronic switch switches voluntarily, and auxiliary power is offered the loop, extremely lacks, need not the CPU intervention switching time, there are not mechanical actions such as relay, everything accomplishs without any letup, and the reliability height has been guaranteed the continuity and the stability of follow-up electric.
Description of drawings
Fig. 1 is the structured flowchart of commutation circuit of the present invention.
Fig. 2 is enforcement circuit theory diagrams of the present invention.
Specific implementation method
As can be seen from Figure 1, the present invention includes main power source, battery, main power source detection of power loss module as auxiliary power, also comprise electronic switch, a diode that is used to prevent the mutually reciprocal filling electric current of major and minor power supply, this diode is connected with main power source, described electronic switch is connected with the output of described main power source detection of power loss module, battery, diode, and the output of diode also is connected with the DC/DC voltage stabilizing circuit and is used for the input power source conversion to all kinds of specification voltages of load institute palpus.The detection of power loss module detects the main power source power supply state, in case when the main power source level is low to moderate certain threshold values (3.6V) then notify electronic switch to open the powered battery loop immediately, system power supply is switched to the back-up source power supply state.
Fig. 2 is the concrete line map of implementing of of commutation circuit of the present invention.
As shown in the figure, system's power supply is formed the power supply that supplies power with double circuit by one road 5V master's current supply circuit and one road 6V powered battery loop.
D5 irritates electric diode for the series connection counnter attack among the figure; Q3～Q4 is that P channel mosfet FDN338P forms power supply switching electronic switch, because the metal-oxide-semiconductor conducting resistance much smaller than general-purpose diode, therefore utilizes MOS to make electronic switch, can effectively reduce the kwh loss of system under the powered battery environment; R15, R14 are that pull-up resistor is used to guarantee that metal-oxide-semiconductor reliably ends; C16 is the slow startup electric capacity in powered battery loop, and effect is when battery is loaded onto in the outside, can provide the buffer starting process for the metal-oxide-semiconductor electronic switch under the primary power source de-energizes situation, guarantees that battery is to follow-up electric; U2 is the power management chip of the lithium battery power supply of a TI company exploitation, and this chip provides 3 road DC/DC power supplys, 3 road LDO power supplys, for all kinds of embedded devices provide power solution flexibly; In addition, this chip provides one road power cut-off detection port (30 pin), forming bleeder circuit by R20, R21 detects the main power source power supply state, when the main power source supply power voltage is lower than 3.6V, the 21st pin output low level that promptly causes power supply chip U21 is connected to ground with resistance R 16 pin, thus unlocking electronic switch Q3, Q4.
Amplifier U3 forms voltage comparator circuit and is used for battery voltage detection, and when cell voltage was lower than 4.4V, the amplifier output low level was used for subsequent conditioning circuit and handles; Q5, U24 form the ON-OFF control circuit of power supply chip U2, are used for each main electricity loop that system is in the system of can turn-offing under the low-power consumption mode, to reduce the entire system power consumption.
Claims (4)
1. dual power supply switching circuit that is used for electronic electric energy meter, comprise main power source, battery as auxiliary power, main power source detection of power loss module, it is characterized in that also comprising electronic switch, one is used to prevent main, the diode of the mutually reciprocal filling electric current of auxiliary power, described electronic switch is connected with the battery output, be used for when the main power source power down, directly auxiliary power being exported, described diode is connected with main power source, be used to block the reverse filling of auxiliary power to main power source, main power source detection of power loss module detects main power source at the diode anode end, and give electronic switch with detection signal, the conducting immediately when main power voltage is lower than threshold values of control electronic switch, the output auxiliary power.
2. dual power supply switching circuit according to claim 1 is characterized in that also being connected with the DC/DC voltage stabilizing circuit at the output of described diode, is used to provide the power supply output loading required all size voltage.
3. dual power supply switching circuit according to claim 1 and 2 is characterized in that described electronic switch is made up of metal-oxide-semiconductor.
4. dual power supply switching circuit according to claim 1 and 2 is characterized in that described main power source is the 4-6 volt, and auxiliary power adopts 6 volts of lithium batteries of forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910263829A CN101719689A (en) | 2009-12-16 | 2009-12-16 | Dual power supply switching circuit for electronic electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910263829A CN101719689A (en) | 2009-12-16 | 2009-12-16 | Dual power supply switching circuit for electronic electric energy meter |
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| Publication Number | Publication Date |
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| CN101719689A true CN101719689A (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910263829A Pending CN101719689A (en) | 2009-12-16 | 2009-12-16 | Dual power supply switching circuit for electronic electric energy meter |
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| CN (1) | CN101719689A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338826A (en) * | 2011-06-17 | 2012-02-01 | 杭州炬华科技股份有限公司 | Three-phase intelligent electric energy meter with auxiliary power supply |
| CN102355044A (en) * | 2011-09-02 | 2012-02-15 | 北京工业大学 | Dual-redundancy aircraft power supply and power supply mode thereof |
| CN103326458A (en) * | 2013-07-09 | 2013-09-25 | 深圳市汇顶科技股份有限公司 | Power supply switching circuit of external power supply and power supply by battery and switching method |
| CN104638757A (en) * | 2015-02-03 | 2015-05-20 | 成都秦川科技发展有限公司 | Double-power-supply power supplying circuit of remote control intelligent gas meter |
| CN104638758A (en) * | 2015-02-03 | 2015-05-20 | 成都秦川科技发展有限公司 | Real-time detection and switching circuit for power supply of remote control intelligent gas meter concentrator |
| CN106293011A (en) * | 2016-08-31 | 2017-01-04 | 华立科技股份有限公司 | The hard reboot reserve battery electric power system of a kind of pair of button multiplexing and processing method |
| CN108307152A (en) * | 2018-01-09 | 2018-07-20 | 国网山东省电力公司滨州供电公司 | A kind of Visualized meter reading device |
| CN109245500A (en) * | 2017-07-10 | 2019-01-18 | 中兴通讯股份有限公司 | Method of supplying power to, apparatus and system |
| CN109245289A (en) * | 2018-10-30 | 2019-01-18 | 广州供电局有限公司 | Low view based on double switch power power supply electric energy meter carries power control circuit |
| CN113825040A (en) * | 2021-09-06 | 2021-12-21 | 贵州电网有限责任公司 | Automatic meter reading system capable of preventing power failure |
-
2009
- 2009-12-16 CN CN200910263829A patent/CN101719689A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338826A (en) * | 2011-06-17 | 2012-02-01 | 杭州炬华科技股份有限公司 | Three-phase intelligent electric energy meter with auxiliary power supply |
| CN102355044A (en) * | 2011-09-02 | 2012-02-15 | 北京工业大学 | Dual-redundancy aircraft power supply and power supply mode thereof |
| CN103326458A (en) * | 2013-07-09 | 2013-09-25 | 深圳市汇顶科技股份有限公司 | Power supply switching circuit of external power supply and power supply by battery and switching method |
| CN103326458B (en) * | 2013-07-09 | 2015-11-25 | 深圳市汇顶科技股份有限公司 | A kind of external power source and battery powered power supply switch circuit |
| CN104638757B (en) * | 2015-02-03 | 2017-02-22 | 成都秦川科技发展有限公司 | Double-power-supply power supplying circuit of remote control intelligent gas meter |
| CN104638757A (en) * | 2015-02-03 | 2015-05-20 | 成都秦川科技发展有限公司 | Double-power-supply power supplying circuit of remote control intelligent gas meter |
| CN104638758A (en) * | 2015-02-03 | 2015-05-20 | 成都秦川科技发展有限公司 | Real-time detection and switching circuit for power supply of remote control intelligent gas meter concentrator |
| CN106293011A (en) * | 2016-08-31 | 2017-01-04 | 华立科技股份有限公司 | The hard reboot reserve battery electric power system of a kind of pair of button multiplexing and processing method |
| CN106293011B (en) * | 2016-08-31 | 2023-09-01 | 华立科技股份有限公司 | Dual-key multiplexing hard-start standby battery power supply system and processing method |
| CN109245500A (en) * | 2017-07-10 | 2019-01-18 | 中兴通讯股份有限公司 | Method of supplying power to, apparatus and system |
| CN108307152A (en) * | 2018-01-09 | 2018-07-20 | 国网山东省电力公司滨州供电公司 | A kind of Visualized meter reading device |
| CN109245289A (en) * | 2018-10-30 | 2019-01-18 | 广州供电局有限公司 | Low view based on double switch power power supply electric energy meter carries power control circuit |
| CN109245289B (en) * | 2018-10-30 | 2023-12-22 | 广东电网有限责任公司广州供电局 | Low-video-load power consumption control circuit based on double-switch power supply electric energy meter |
| CN113825040A (en) * | 2021-09-06 | 2021-12-21 | 贵州电网有限责任公司 | Automatic meter reading system capable of preventing power failure |
| CN113825040B (en) * | 2021-09-06 | 2023-11-10 | 贵州电网有限责任公司 | Automatic meter reading system capable of preventing power failure |
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Open date: 20100602 |