CN201238208Y - Automatic switchover circuit between commercial power and battery power supply - Google Patents
Automatic switchover circuit between commercial power and battery power supply Download PDFInfo
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- CN201238208Y CN201238208Y CNU2008200592273U CN200820059227U CN201238208Y CN 201238208 Y CN201238208 Y CN 201238208Y CN U2008200592273 U CNU2008200592273 U CN U2008200592273U CN 200820059227 U CN200820059227 U CN 200820059227U CN 201238208 Y CN201238208 Y CN 201238208Y
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Abstract
The utility model discloses an automatic switching circuit for the commercial power and battery power; wherein, a DC power interface is connected with the input terminal of a voltage regulator; the output terminal of the voltage regulator is connected with a voltage regulation output terminal; an AC voltage interface is connected with the input terminal of an AC/DC converter circuit; the first output terminal of the AC/DC converter circuit is connected with the voltage regulation output terminal; the second output terminal of the AC/DC converter circuit is connected with the input terminal of an AC power detecting circuit; the output terminal of the AC power detecting circuit is connected with the first input terminal of a DC power controlling circuit; the second input terminal of the DC power controlling circuit is connected with a signal chip interface, and the output terminal of the DC power controlling circuit is connected with the controlling terminal of the voltage regulator. The automatic switching circuit has the advantages that the DC power can be fully cut off during supplying the AC, thereby avoiding the consumption of DC power. When DC is supplied, no current passes through the feedback circuit of the AC/DC converter circuit, thereby avoiding the additional consumption of DC power and prolongs the service hours of the DC power.
Description
Technical field
The utility model relates to circuit field, is specifically related to a kind of civil power and battery powered automatic switch-over circuit.
Background technology
Many instrument have electric main power supply and two kinds of powering modes of dc-battery power supply.Shown in Fig. 4-1, the linear voltage regulator when U24 is direct current supply, following circuit are to be the AC-DC Switching Power Supply of core with U15, the voltage stabilizing circuit during for Alternating Current Power Supply.If two kinds of power supplys simply directly connect by the mode of Fig. 4-1, then when only using powered battery, feedback circuit U20, the U23 of Switching Power Supply still has suitable electric current to pass through, and increased the battery power consumption, reduced the operating time.When AC power and DC power supply existed simultaneously, DC power supply can not be cut off fully, still has to can not determine big or small electrical source consumption.
Summary of the invention
The purpose of this utility model be to provide a kind of can be when Alternating Current Power Supply the civil power and the battery powered automatic switch-over circuit of automatic switchover DC power supply.
To achieve these goals, the technical solution of the utility model is as follows: civil power and battery powered automatic switch-over circuit, comprise the DC power supply interface, AC power interface, it is characterized in that this DC power supply interface is connected with the first input end of pressurizer, the output of pressurizer is connected with output end of pressure-stabilizing, the alternating voltage interface is connected with the input of ac-dc converter circuit, first output of ac-dc converter circuit is connected with output end of pressure-stabilizing, second output of ac-dc converter circuit is connected with the input of AC power testing circuit, the output of AC power testing circuit is connected with the first input end of DC power supply control circuit, second input of DC power supply control circuit is connected with interface microcontroller, and the output of DC power supply control circuit is connected with the control end of pressurizer.
Can cut off DC power supply fully when advantage of the present utility model is Alternating Current Power Supply, avoid the consumption of DC power supply.When direct current supply, the feedback circuit of ac-dc converter circuit does not have electric current to pass through, and has avoided the additive decrementation of DC power supply, has prolonged the operating time of DC power supply.
Description of drawings
Fig. 1 is the circuit diagram of prior art
Fig. 2 is a block diagram of the present utility model
Fig. 3 is the circuit diagram of the utility model one embodiment
Embodiment
Below in conjunction with drawings and Examples the utility model is elaborated.
Among Fig. 2 a kind of civil power and battery powered automatic switch-over circuit, comprise DC power supply interface 1, AC power interface 3, it is characterized in that this DC power supply interface 1 is connected with the first input end of pressurizer 2, the output of pressurizer 2 is connected with output end of pressure-stabilizing 8, alternating voltage interface 3 is connected with the input of ac-dc converter circuit 4, first output of ac-dc converter circuit 4 is connected with output end of pressure-stabilizing 8, second output of ac-dc converter circuit 4 is connected with the input of AC power testing circuit 5, the output of AC power testing circuit 5 is connected with the first input end of DC power supply control circuit 6, second input of DC power supply control circuit 6 is connected with interface microcontroller 7, and the output of DC power supply control circuit 6 is connected with the control end of pressurizer 2.
As shown in Figure 3, ac-dc converter circuit 4 comprises AC-DC conversion module 9 and feedback module 10, the first input end of AC-DC conversion module 9 is connected with AC power interface 3, the output of this AC-DC conversion module 9 is connected with output end of pressure-stabilizing 8, comprise a transformer B1 in the AC-DC conversion module 9, the secondary output end of transformer B1 is connected with the input of AC power testing circuit 5, the output of AC power testing circuit 5 is connected with the input of feedback module 10, and the output of feedback module is connected with second input of AC-DC conversion module.Wherein AC-DC conversion module 9 and feedback module 10 are prior art, do not repeat them here.Wherein the model of U15 is TL431.
The circuit of AC power testing circuit 5 is: the transformer B1 secondary output end of AC-DC conversion module 9 is connected with the positive pole of the first diode D27, the negative pole of the first diode D27 is connected with an end of capacitor C 77, the other end ground connection of capacitor C 77, the negative pole of the first diode D27 is the output of AC power testing circuit 5, is connected with the AC-ON port of output end of pressure-stabilizing 8.
The circuit of DC power supply control circuit 6 is: the negative pole of voltage stabilizing didoe D28 is connected with the output of AC power testing circuit 5, the positive pole of voltage stabilizing didoe D28 is connected with the base stage of the first triode Q11 by first resistance R 128, the grounded emitter of the first triode Q11, the collector electrode of first utmost point pipe Q11 is connected with the control end of pressurizer 2, the base stage of the first triode Q11 also is connected with an end of second resistance R 129, the other end of second resistance R 129 is connected with the collector electrode of the second triode Q12, the grounded emitter of the second triode Q12, the collector electrode of the second triode Q12 also is connected with the input of pressurizer 2 by the 5th resistance, the base stage of the second triode Q12 is connected with an end of the 3rd resistance R 125, the other end of the 3rd resistance R 125 is connected with an end of the 4th resistance R 131, the other end of the 4th resistance R 131 is connected with the DC-ON port of interface microcontroller 7, the DC-ON port of interface microcontroller 7 is by the 5th resistance R 132 ground connection, the base stage of the first triode Q11 also is connected with the positive pole of the second diode D25, the negative pole of the second diode D25 is connected with the ON/OFF port of interface microcontroller 7, the output of pressurizer 2 is connected with the base stage of the second triode Q12 with first capacitor C 81 by the 6th resistance R 121, the tie point of the 6th resistance R 121 and first capacitor C 81 also is connected with the positive pole of the 3rd diode D26, and the negative pole of the 3rd diode D26 is connected with the ON/OFF port of interface microcontroller 7.
Wherein pressurizer 2 is the direct current supply voltage stabilizing circuit of core for the LDO linear voltage regulator that band turn-offs control, and this technology is a prior art, does not repeat them here.The AC-DC conversion module of ac-dc converter circuit 4 and feedback module are prior art also, do not repeat them here.
The ON/OFF port of interface microcontroller 7 is for pressing key control switch power supply signal, and shorted to earth is a switch power supply, and the DC-ON port of interface microcontroller 7 is the switching signal of Single-chip Controlling DC power supply, and high level is for opening, and low level is for closing.
When using direct current supply, because the AC-ON signal voltage that AC power testing circuit 5 provides is zero, the feedback module of ac-dc converter circuit 4 does not have electric current to pass through, and DC power supply does not have extra current drain.During ac power supply, the AC-ON signal of AC power testing circuit 5 output is a high level, makes the first triode Q11 conducting through the voltage stabilizing didoe D28 and first resistance R 128 of DC power supply control circuit 6, and pressurizer 2 is turn-offed, and DC power supply quits work.
Claims (4)
1, civil power and battery powered automatic switch-over circuit, comprise the DC power supply interface, AC power interface, it is characterized in that this DC power supply interface is connected with the first input end of pressurizer, the output of pressurizer is connected with output end of pressure-stabilizing, the alternating voltage interface is connected with the input of ac-dc converter circuit, first output of ac-dc converter circuit is connected with output end of pressure-stabilizing, second output of ac-dc converter circuit is connected with the input of AC power testing circuit, the output of AC power testing circuit is connected with the first input end of DC power supply control circuit, second input of DC power supply control circuit is connected with interface microcontroller, and the output of DC power supply control circuit is connected with the control end of pressurizer.
2, civil power as claimed in claim 1 and battery powered automatic switch-over circuit, it is characterized in that ac-dc converter circuit comprises AC-DC conversion module and feedback module, the first input end of AC-DC conversion module is connected with AC power interface, the output of this AC-DC conversion module is connected with output end of pressure-stabilizing, comprise a transformer in the AC-DC conversion module, the secondary output end of transformer is connected with the input of AC power testing circuit, the output of AC power testing circuit is connected with the input of feedback module, and the output of feedback module is connected with second input of AC-DC conversion module.
3, civil power as claimed in claim 2 and battery powered automatic switch-over circuit, the transformer secondary output output that it is characterized in that the AC-DC conversion module is connected with the positive pole of first diode, the negative pole of first diode is connected with an end of electric capacity, the other end ground connection of electric capacity, the negative pole of first diode is the output of AC power testing circuit, is connected with the AC-ON port of output end of pressure-stabilizing.
4, civil power as claimed in claim 3 and battery powered automatic switch-over circuit, the circuit that it is characterized in that the DC power supply control circuit is: the negative pole of voltage stabilizing didoe is connected with the output of AC power testing circuit, the positive pole of voltage stabilizing didoe is connected with the base stage of first triode by first resistance, the grounded emitter of first triode, the collector electrode of first utmost point pipe is connected with the control end of pressurizer, the base stage of first triode also is connected with an end of second resistance, the other end of second resistance is connected with the collector electrode of second triode, the grounded emitter of second triode, the collector electrode of second triode also is connected with the input of pressurizer by the 5th resistance, the base stage of second triode is connected with the DC-ON port of interface microcontroller, the base stage of first triode also is connected with the positive pole of second diode, the negative pole of second diode is connected with the ON/OFF port of interface microcontroller, the output of pressurizer is connected with the base stage of first electric capacity with second triode by the 6th resistance, the tie point of the 6th resistance and first electric capacity also is connected with the positive pole of the 3rd diode, and the negative pole of second diode is connected with the ON/OFF port of interface microcontroller 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200592273U CN201238208Y (en) | 2008-05-30 | 2008-05-30 | Automatic switchover circuit between commercial power and battery power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200592273U CN201238208Y (en) | 2008-05-30 | 2008-05-30 | Automatic switchover circuit between commercial power and battery power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201238208Y true CN201238208Y (en) | 2009-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200592273U Expired - Fee Related CN201238208Y (en) | 2008-05-30 | 2008-05-30 | Automatic switchover circuit between commercial power and battery power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201238208Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593999B (en) * | 2008-05-30 | 2011-08-31 | 上海耀华称重***有限公司 | Automatic switching circuit for supplying power to city and battery |
| CN108011503A (en) * | 2017-11-03 | 2018-05-08 | 苏州莱测检测科技有限公司 | Voltage regulation type power output apparatus is used in one kind detection |
-
2008
- 2008-05-30 CN CNU2008200592273U patent/CN201238208Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593999B (en) * | 2008-05-30 | 2011-08-31 | 上海耀华称重***有限公司 | Automatic switching circuit for supplying power to city and battery |
| CN108011503A (en) * | 2017-11-03 | 2018-05-08 | 苏州莱测检测科技有限公司 | Voltage regulation type power output apparatus is used in one kind detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20140530 |