CN202906569U - Internal and external power-supply switching circuit for electric energy meter - Google Patents
Internal and external power-supply switching circuit for electric energy meter Download PDFInfo
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- CN202906569U CN202906569U CN 201220642895 CN201220642895U CN202906569U CN 202906569 U CN202906569 U CN 202906569U CN 201220642895 CN201220642895 CN 201220642895 CN 201220642895 U CN201220642895 U CN 201220642895U CN 202906569 U CN202906569 U CN 202906569U
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Abstract
The utility model discloses an internal and external power-supply switching circuit for an electric energy meter and the power-supply switching circuit comprises a main power supply, a battery power supply, an on-off switch, a control resistor and a diode, wherein the main power supply is connected with a control terminal of the on-off switch by the control resistor. An anode of the diode is connected with the main power supply, and a cathode is connected with an output terminal of the on-off switch and is simultaneously connected with a load end. Turning-off or conduction of the on-off switch is directly controlled by electrifying or electric failure of the 3.3 V main power supply, so that switching of the internal and external power supply is realized. The circuit is simple, control is stable and reliable and the circuit can ensure continuous and stable power supply for the subsequent load.
Description
Technical field
The utility model relates to a kind of commutation circuit, particularly a kind of internal/external power commutation circuit for electric energy meter.
Background technology
In the existing 5V system, external power source 5V power supply and the switching that low-power consumption battery 3.6V powers can realize by two diodes.Along with the develop rapidly of microelectric technique, the low pressure chip that volume is less, speed is faster, power consumption is lower, cost performance is higher continues to bring out.The computation chip and the managing chip that are operated under the 3.3V power environment more appear in the design of electric energy meter meter.Be compared to original 5V system, the switching control problem of the 3.3V system is a then many external power source and low-power consumption battery powered.This is because the 3.3V of external power source is also low through the voltage behind the diode through the voltage ratio 3.6V battery after the diode.Can certainly consider to heighten 3.3V voltage and solve with the reduction cell voltage, can not be higher than 3.3V+10% but problem is the normal working voltage of 3.3V computation chip and managing chip.The abnormal problem of liquid crystal display when in addition, selecting the 3V powered battery also to have low-power consumption.
The utility model content
The purpose of this utility model provides a kind of reliable and stable internal/external power commutation circuit that is used for electric energy meter.
This internal/external power commutation circuit for electric energy meter that the utility model provides, comprise main power source, battery supply, on-off switch, a controlling resistance and first diode, main power source links to each other with the control end of on-off switch by controlling resistance, the anode of the first diode links to each other with main power source, its negative electrode links to each other with the output of on-off switch, and its negative electrode links to each other with load end simultaneously.
Described on-off switch adopts metal-oxide-semiconductor.Shutoff or the conducting of metal-oxide-semiconductor are directly controlled in the power or power-down of described main power source, thereby realize the switching of inside and outside power supply.
The utility model circuit design is simply effective, and switching controls is reliable and stable, guarantees continuously and stably to follow-up load supplying.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is the circuit diagram of a kind of embodiment of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises main power source, battery supply, on-off switch, a controlling resistance and first diode, main power source links to each other with the control end of on-off switch by controlling resistance, the anode of the first diode links to each other with main power source, its negative electrode links to each other with the output of on-off switch, and its negative electrode links to each other with load end simultaneously.Controlling resistance is used for main power source to the control of battery supply.The first diode is used for preventing that battery supply from oppositely filling with the generation of electric current to main power source.
As shown in Figure 2, main power source is the 3.3V power supply that is provided by external power source, and battery supply is provided by inner 3.6V battery, and on-off switch adopts metal-oxide-semiconductor.System power supply forms the power supply that supplies power with double circuit by the battery supply that 3.3V main power source and a route 3.6V battery of one tunnel external power source provides.
Main power source V3P3 links to each other with the anode of diode VD3, and the negative electrode of the first diode VD3 links to each other with plate working power VBB.Main power source V3P3 links to each other with the grid of on-off switch Q1 by controlling resistance R12; Its drain electrode links to each other with plate working power VBB, simultaneously by capacitor C 10 ground connection; Its source electrode links to each other with battery supply VBAT by the second diode VD1.The first diode VD3 prevents that battery supply VBAT from oppositely filling with electric current to main power source V3P3 and producing; On-off switch Q1 adopts P channel mosfet pipe, and its model is IRLML6401.During the external power source normal power supply, on-off switch Q1 reliably ends, and battery supply VBAT disconnects.When power supply V3P3 voltage drops into the source voltage 0.4V that is lower than on-off switch Q1 when above, by the control of controlling resistance R12, on-off switch Q1 gets final product conducting (conducting resistance≤0.125 Ω), and system transfers battery supply VBAT power supply to.Because the conducting resistance of metal-oxide-semiconductor is very little, can effectively reduce the kwh loss of system under battery supply VBAT power supply environment.This moment, plate working power VBB was higher than main power source V3P3, and outside main power source V3P3 no longer gives system power supply.Because the existence of the first diode VD3 is arranged, battery supply VBAT can oppositely not fill with electric current to main power source V3P3 yet.And restore electricity when external power source, main power source V3P3 rises to 2.5V when above, and by the control of controlling resistance R12, on-off switch Q1 gets final product reliable turn-off, and system recovers to be powered by outside main power source V3P3.Can realize thus by the powering on of outside main power source V3P3, reliable switching that internal/external power is directly controlled in power down.
Claims (3)
1. internal/external power commutation circuit that is used for electric energy meter, comprise main power source, battery supply, on-off switch, it is characterized in that, also comprise a controlling resistance and first diode, main power source links to each other with the control end of on-off switch by controlling resistance, the anode of the first diode links to each other with main power source, and its negative electrode links to each other with the output of on-off switch, and its negative electrode links to each other with load end simultaneously.
2. the internal/external power commutation circuit for electric energy meter according to claim 1 is characterized in that, described on-off switch adopts metal-oxide-semiconductor.
3. the internal/external power commutation circuit for electric energy meter according to claim 1 is characterized in that, shutoff or the conducting of metal-oxide-semiconductor are directly controlled in the power or power-down of described main power source, thereby realizes the switching of inside and outside power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220642895 CN202906569U (en) | 2012-11-29 | 2012-11-29 | Internal and external power-supply switching circuit for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220642895 CN202906569U (en) | 2012-11-29 | 2012-11-29 | Internal and external power-supply switching circuit for electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202906569U true CN202906569U (en) | 2013-04-24 |
Family
ID=48127192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220642895 Expired - Lifetime CN202906569U (en) | 2012-11-29 | 2012-11-29 | Internal and external power-supply switching circuit for electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202906569U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515171A (en) * | 2015-12-03 | 2016-04-20 | 杭州西力电能表制造有限公司 | Adaptive power supply monitoring and switching circuit and application control method thereof |
| CN109617040A (en) * | 2018-12-24 | 2019-04-12 | 出门问问信息科技有限公司 | A kind of power supply circuit |
-
2012
- 2012-11-29 CN CN 201220642895 patent/CN202906569U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515171A (en) * | 2015-12-03 | 2016-04-20 | 杭州西力电能表制造有限公司 | Adaptive power supply monitoring and switching circuit and application control method thereof |
| CN109617040A (en) * | 2018-12-24 | 2019-04-12 | 出门问问信息科技有限公司 | A kind of power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
|
| CX01 | Expiry of patent term |