CN206557275U - A kind of AC dump warning circuit - Google Patents
A kind of AC dump warning circuit Download PDFInfo
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- CN206557275U CN206557275U CN201720089562.7U CN201720089562U CN206557275U CN 206557275 U CN206557275 U CN 206557275U CN 201720089562 U CN201720089562 U CN 201720089562U CN 206557275 U CN206557275 U CN 206557275U
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Abstract
The utility model discloses a kind of AC dump warning circuit, the AC dump warning circuit includes：Halfwave rectifier sample circuit, halfwave rectifier voltage-multiplying circuit, power down optocoupler drive circuit and alarm signal output circuit；The halfwave rectifier sample circuit is connected with the halfwave rectifier voltage-multiplying circuit, and is connected with the power down optocoupler drive circuit；The halfwave rectifier voltage-multiplying circuit is connected with the power down optocoupler drive circuit；The power down optocoupler drive circuit is connected with the alarm signal output circuit；The halfwave rectifier sample circuit, the halfwave rectifier voltage-multiplying circuit, the equal of the power down optocoupler drive circuit are connected with alternating current zero line.The utility model can accurately realize AC dump alarm function.
Description
Technical field
The utility model is related to field of circuit technology, more particularly to a kind of AC dump warning circuit.
Background technology
Current AC/DC Switching Power Supplies, it is most of to require that there is AC dump alarm function.Conventional AC dump detection electricity
Road is as shown in figure 1, it includes the current rectifying and wave filtering circuit being made up of rectifier bridge U1, electric capacity C1；Adopted by resistance R1, R2 voltage constituted
Sample circuit；By current-limiting resistance R3, R4, R5, triode VT1, the optocoupler of optocoupler N1 compositions drives and alarm signal output circuit.Its
Operation principle is：When inputting normal, AC gives three by rectifier bridge U1 rectifications, electric capacity C1 energy storage filtering, resistance R1, R2 partial pressure
Pole pipe VT1 powers, and triode VT1 conductings are to drive optocoupler N1, optocoupler N1 to turn on, and alarm signal end LOS is output as low level,
Do not alert.When inputting AC power down, triode VT1 can turn on a period of time, as the voltage on electric capacity C1 is gradually reduced, until
R1, R2 partial pressure can not be driven after triode VT1, and triode shut-off, optocoupler is not turned on, and alarm signal end LOS is output as high electricity
It is flat, send alarm.
Common AC power-fail detection circuit AC power fail warning precision is low, and with certain time delay.The circuit rectifies bridge
Sampled signal is obtained by the mode of electric resistance partial pressure after rectification, then drives optocoupler to send alarm signal by triode.Due to defeated
Enter AC and R2, VT1 not altogether, this make it that the precision of sampled signal is relatively low.
Utility model content
For defect of the prior art, the utility model provides a kind of AC dump warning circuit, can be accurately
Realize AC dump alarm function.
The utility model provides a kind of AC dump warning circuit, including：Halfwave rectifier sample circuit, halfwave rectifier times
Volt circuit, power down optocoupler drive circuit, alarm signal output circuit；Wherein,
The halfwave rectifier sample circuit is connected with the halfwave rectifier voltage-multiplying circuit, and drives electricity with the power down optocoupler
Road is connected；The halfwave rectifier voltage-multiplying circuit is connected with the power down optocoupler drive circuit；The power down optocoupler drive circuit with
The alarm signal output circuit connection；The halfwave rectifier sample circuit, the halfwave rectifier voltage-multiplying circuit, the power down light
Coupling drive circuit is connected with alternating current zero line；
Wherein,
The halfwave rectifier sample circuit is used for when alternating current is normally inputted, and gathers alternating current input voltage signal, and
Voltage sampling signal is obtained by partial pressure, the voltage sampling signal is used to drive the power down optocoupler drive circuit；Described half
Ripple rectification multiple pressuring circuit utilizes the input voltage signal energy storage, is the power down optocoupler drive circuitry；The alarm letter
Number output circuit is used to send alarm signal in AC dump.
Further, the halfwave rectifier sample circuit, including：First resistor R1, second resistance R2, the first diode
VD1；The first end of the second resistance R2 is connected with the negative pole of the first diode VD1, and the second of the second resistance R2
End is connected with zero line；The positive pole of the first diode VD1 is connected with the first end of the first resistor R1；The first resistor
R1 the second end is connected with live wire, and is connected with the halfwave rectifier voltage-multiplying circuit.
Further, the halfwave rectifier sample circuit also include the first electric capacity C1, the first electric capacity C1C2 with it is described
Second resistance R2 is in parallel.
Further, the first electric capacity C1 is filter capacitor, and the capacitance of the first electric capacity C1 is less than or equal to
10 microfarads.
Further, the first resistor R1 and second resistance R2 is divider resistance, and the first diode VD1 is
Commutation diode.
Further, the halfwave rectifier voltage-multiplying circuit includes：Second electric capacity C2, the 3rd electric capacity C3, the second diode
VD2, the 3rd diode VD3,3rd resistor R3；The negative pole of the 3rd electric capacity C3 is connected with the zero line, the 3rd electric capacity
C3 positive pole is connected with the negative pole of the second diode VD2, and is connected with the power down optocoupler drive circuit；Described 2nd 2
Pole pipe VD2 positive pole is connected with the first end of the 3rd resistor R3；The second end of the 3rd resistor R3 and the described second electricity
Hold C2 first end connection, and be connected with the negative pole of the 3rd diode VD3, the positive pole of the 3rd diode VD3 and institute
State zero line connection；The second end of the second electric capacity C2 is connected with the halfwave rectifier sample circuit.
Further, the second electric capacity C2 is storage capacitor, the second diode VD2 and the 3rd diode
VD3 is commutation diode, and the 3rd resistor R3 is current-limiting resistance.
Further, the power down optocoupler drive circuit includes：Transistor VT1, the 4th resistance R4, the 5th resistance
R5, optocoupler N1；
The emitter stage of the transistor VT1 is connected with the zero line, the colelctor electrode of the transistor VT1 and institute
Optocoupler N1 first end connection is stated, the base stage of the transistor VT1 is connected with the first end of the 4th resistance R4；
The second end of the optocoupler N1 is connected with the first end of the 5th resistance R5, and the second of the 4th resistance R4
End is connected with the halfwave rectifier sample circuit；The second end of the 5th resistance R5 connects with the halfwave rectifier voltage-multiplying circuit
Connect；The 3rd end of the optocoupler N1 is connected with the alarm signal output circuit, the 4th end ground connection of the optocoupler N1；
Wherein, the transistor VT1 is turned in normal input voltage, and drives the optocoupler N1 to turn on；It is described
Transistor VT1 is turned off after input voltage disconnection, and the optocoupler N1 is not turned on.
Further, the power down optocoupler drive circuit also includes voltage-regulator diode VZ1, the voltage-regulator diode VZ1's
Positive pole is connected with the zero line, and the negative pole of the voltage-regulator diode VZ1 is connected with the second end of the 5th resistance R5；It is described
Voltage-regulator diode VZ1 is protection device.
Further, the alarm signal output circuit includes：6th resistance R6, signal output part；6th resistance
R6 first end and the optocoupler N1 three-terminal link, and being connected with the signal output part, the of the 6th resistance R6
Two ends are connected with external power supply；The 6th resistance R6 is current-limiting resistance；The signal output part is used in the optocoupler N1 not
Alarm signal is sent during conducting.
As shown from the above technical solution, the AC dump warning circuit that the utility model is provided, the halfwave rectifier sampling
The ground potential of circuit, halfwave rectifier voltage-multiplying circuit and power down optocoupler drive circuit is all connected to alternating current zero line, and the first electric capacity
C1 capacity very littles, can in high precision, realize to low latency AC dump alarm function.
Brief description of the drawings
Fig. 1 shows alternative current power failure detection circuit figure commonly used in the prior art.
Fig. 2 shows the AC dump warning circuit figure that the utility model is provided.
Embodiment
The embodiment of technical solutions of the utility model is described in detail below in conjunction with accompanying drawing.Following examples are only
For clearly illustrating the technical solution of the utility model, therefore example is only used as, and this practicality can not be limited with this
New protection domain.
It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be this reality
The ordinary meaning understood with new one of ordinary skill in the art.
As shown in Fig. 2 the utility model embodiment provides a kind of AC dump warning circuit, including：Halfwave rectifier is adopted
Sample circuit, halfwave rectifier voltage-multiplying circuit, power down optocoupler drive circuit, alarm signal output circuit；Wherein, the halfwave rectifier is adopted
Sample circuit is connected with the halfwave rectifier voltage-multiplying circuit, and is connected with the power down optocoupler drive circuit；The halfwave rectifier times
Volt circuit is connected with the power down optocoupler drive circuit；The power down optocoupler drive circuit connects with the alarm signal output circuit
Connect；The halfwave rectifier sample circuit, the halfwave rectifier voltage-multiplying circuit, the power down optocoupler drive circuit with alternating current zero
Line is connected, and the halfwave rectifier sample circuit, the halfwave rectifier voltage-multiplying circuit, the power down optocoupler drive circuit are relative to same
One potential reference point, therefore, it is possible to improve the precision of collection voltages, and then can accurately realize alarm function.
Wherein, the halfwave rectifier sample circuit is used for when alternating current is normally inputted, collection alternating current input voltage letter
Number, and voltage sampling signal is obtained by partial pressure, the voltage sampling signal is used to drive the power down optocoupler drive circuit；Institute
Halfwave rectifier voltage-multiplying circuit is stated using the input voltage signal energy storage, is the power down optocoupler drive circuitry, works as detection
To after input voltage, power down optocoupler drive circuit is started working；The alarm signal output circuit is used to send out in AC dump
Go out alarm signal.
The construction and mechanism of each circuit are described further below：
The halfwave rectifier sample circuit, including：First resistor R1, second resistance R2, the first diode VD1；Described
Two resistance R2 first end is connected with the negative pole of the first diode VD1, and the second end and the zero line of the second resistance R2 connect
Connect；The positive pole of the first diode VD1 is connected with the first end of the first resistor R1；The second of the first resistor R1
End is connected with live wire, and is connected with the halfwave rectifier voltage-multiplying circuit.Wherein, the first resistor R1 and second resistance R2
It is also sampling resistor for divider resistance, the first diode VD1 is commutation diode.
The halfwave rectifier sample circuit also includes the first electric capacity C1, the first electric capacity C1 and the second resistance R2 simultaneously
Connection.Wherein, the first electric capacity C1 is filter capacitor, and its capacitance is less than or equal to 10 microfarads, preferably greater than equal to 3
Microfarad and less than or equal to 5 microfarads.
The halfwave rectifier sample circuit can provide input voltage signal for subsequent conditioning circuit, and its operation principle is：Handing over
When stream electricity is normally inputted, alternating current input voltage signal is gathered, the first diode VD1 carries out rectification, the first electricity to alternating voltage
Hinder R1 and second resistance R2 and carry out partial pressure by both ratio, second resistance R2R6 partial pressure passes through as voltage sampling signal
First electric capacity C1 passes to power down optocoupler drive circuit, for driving power down optocoupler drive circuit to start working, while the first electricity
Hold C1 voltage rise；In AC dump, input voltage disconnects, because the first electric capacity C1 capacitance is smaller, the first electric capacity
C1 voltage is reduced rapidly, and the voltage on second resistance R2 is reduced rapidly, and voltage sampling signal disconnects rapidly, the driving of power down optocoupler
Circuit is stopped rapidly.
The halfwave rectifier voltage-multiplying circuit includes：The second electric capacity diode VD2 of C2, the 3rd electric capacity C3, second, the three or two pole
Pipe VD3,3rd resistor R3；The negative pole of the 3rd electric capacity C3 is connected with the zero line, the positive pole of the 3rd electric capacity C3 and institute
The second diode VD2 negative pole connection is stated, and is connected with the power down optocoupler drive circuit；The second diode VD2 is just
Pole is connected with the first end of the 3rd resistor R3；The second end of the 3rd resistor R3 and the first end of the second electric capacity C2
Connection, and be connected with the negative pole of the 3rd diode VD3, the positive pole of the 3rd diode VD3 is connected with the zero line；Institute
The second end for stating the second electric capacity C2 is connected with the halfwave rectifier sample circuit.
Wherein, the second electric capacity C2 is storage capacitor, and the second diode VD2 and the 3rd diode VD3 are
Commutation diode, the 3rd resistor R3 is current-limiting resistance；Preferably, the 3rd electric capacity C3 is polarized electric capacity, is preferably
Electrochemical capacitor or macromolecule organic semiconductor solid capacitance, wherein, electrochemical capacitor can be alminium electrolytic condenser or tantalum electrochemical capacitor.
The operation principle of the halfwave rectifier voltage-multiplying circuit is：When alternating current is normally inputted, the second electric capacity C2 utilizes defeated
Enter voltage signal energy storage, and power supply is provided for power down optocoupler drive circuit.
The power down optocoupler drive circuit includes：Transistor VT1, the 4th resistance R4, the 5th resistance R5, optocoupler N1；
The emitter stage of the transistor VT1 is connected with the zero line, the colelctor electrode of the transistor VT1 and institute
Optocoupler N1 first end connection is stated, the base stage of the transistor VT1 is connected with the first end of the 4th resistance R4；
The second end of the optocoupler N1 is connected with the first end of the 5th resistance R5, and the second of the 4th resistance R4
End is connected with the halfwave rectifier sample circuit；The second end of the 5th resistance R5 connects with the halfwave rectifier voltage-multiplying circuit
Connect；The 3rd end of the optocoupler N1 is connected with the alarm signal output circuit, the 4th end ground connection of the optocoupler N1；The crystalline substance
Body triode VT1 is used to drive optocoupler N1, optocoupler N1 to be used for isolation drive.
The operation principle of the power down optocoupler drive circuit is：When alternating current is normally inputted, halfwave rectifier sample circuit
The voltage sampling signal obtained through partial pressure drives the transistor VT1 conductings, and transistor VT1 drives the optocoupler
N1 is turned on；In AC dump, the voltage sampling signal is interrupted rapidly, and transistor VT1 disconnects rapidly, the optocoupler N1
It is changed into being not turned on from conducting.
Preferably, the power down optocoupler drive circuit also includes voltage-regulator diode VZ1, and the voltage-regulator diode VZ1 is just
Pole is connected with the zero line, and the negative pole of the voltage-regulator diode VZ1 is connected with the second end of the 5th resistance R5；It is described steady
It is protection device to press diode VZ1.
Preferably, the transistor VT1 is NPN type triode or metal-oxide-semiconductor as shown in Figure 2, alternatively, the crystalline substance
Body triode VT1 can also be PNP type triode, when using PNP type triode, need to make adaptability to the connected mode of circuit
Modification.
The alarm signal output circuit includes：6th resistance R6, signal output part；The first of the 6th resistance R6
End and the three-terminal link of the optocoupler N1, and be connected with the signal output part, the second end of the 6th resistance R6 with outside
Meet the additional high level VO+ in power supply connection, such as Fig. 2；The 6th resistance R6 is current-limiting resistance.
Its operation principle is：When alternating current is normally inputted, the optocoupler N1 conductings of power down optocoupler drive circuit, the signal
Output end LOS is low level, now not outputting alarm signal；When alternating current power failure, optocoupler N1 is not turned on, and the signal is defeated
It is high level to go out to hold LOS, now outputting alarm signal, and because optocoupler N1 is very fast to the response of power down, alarm signal output circuit is defeated
Go out that alarm signal is also very fast, the time delay of alarm substantially reduces.
Based on above content, the exemplary embodiment that the utility model is provided, by by halfwave rectifier sample circuit, half-wave
The ground potential of rectification multiple pressuring circuit and power down optocoupler drive circuit is all connected to the zero line of input AC electricity, makes the ginseng of three circuits
Examine potential identical, it is possible to increase the precision of AC dump alarm；Meanwhile, prior art generally uses the electric capacity of larger capacity, when
During AC dump, the electric discharge of electric capacity needs certain time, can thus make alarm signal postpone just to send after a period of time, reaction
It is not sensitive enough, and the embodiment of the present application makes voltage during its AC dump drop rapidly by using the less first electric capacity C1 of capacity
It is low, and then transistor VT1 is judged rapidly, optocoupler N1 judges rapidly, and alarm signal output circuit sends rapidly alarm letter
Number, therefore, it is possible to the time delay of effectively reduction AC dump alarm.
Finally it should be noted that：Various embodiments above is only limited to illustrate the technical solution of the utility model, rather than to it
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type, it all should cover among claim of the present utility model and the scope of specification.
Claims (10)
1. a kind of AC dump warning circuit, it is characterised in that including：Halfwave rectifier sample circuit, halfwave rectifier voltage-multiplying circuit,
Power down optocoupler drive circuit, alarm signal output circuit；Wherein,
The halfwave rectifier sample circuit is connected with the halfwave rectifier voltage-multiplying circuit, and is connected with the power down optocoupler drive circuit
Connect；
The halfwave rectifier voltage-multiplying circuit is connected with the power down optocoupler drive circuit；
The power down optocoupler drive circuit is connected with the alarm signal output circuit；
The halfwave rectifier sample circuit, the halfwave rectifier voltage-multiplying circuit, the power down optocoupler drive circuit are and alternating current
Zero line is connected；
Wherein,
The halfwave rectifier sample circuit is used for when alternating current is normally inputted, and gathers alternating current input voltage signal, and pass through
Partial pressure obtains voltage sampling signal, and the voltage sampling signal is used to drive the power down optocoupler drive circuit；
The halfwave rectifier voltage-multiplying circuit utilizes the input voltage signal energy storage, is the power down optocoupler drive circuitry；
The alarm signal output circuit is used to send alarm signal in AC dump.
2. AC dump warning circuit according to claim 1, it is characterised in that the halfwave rectifier sample circuit, bag
Include：First resistor R1, second resistance R2, the first diode VD1；
The first end of the second resistance R2 is connected with the negative pole of the first diode VD1, and the second of the second resistance R2
End is connected with zero line；
The positive pole of the first diode VD1 is connected with the first end of the first resistor R1；
The second end of the first resistor R1 is connected with live wire, and is connected with the halfwave rectifier voltage-multiplying circuit.
3. AC dump warning circuit according to claim 2, it is characterised in that the halfwave rectifier sample circuit is also wrapped
Include the first electric capacity C1, the first electric capacity C1 in parallel with the second resistance R2.
4. AC dump warning circuit according to claim 3, it is characterised in that the first electric capacity C1 is filtered electrical
Hold, the capacitance of the first electric capacity C1 is less than or equal to 10 microfarads.
5. AC dump warning circuit according to claim 2, it is characterised in that the first resistor R1 and described second
Resistance R2 is divider resistance, and the first diode VD1 is commutation diode.
6. AC dump warning circuit according to claim 1, it is characterised in that the halfwave rectifier voltage-multiplying circuit bag
Include：The second electric capacity diode of C2, the 3rd electric capacity C3, second VD2, the 3rd diode VD3,3rd resistor R3；
The negative pole of the 3rd electric capacity C3 is connected with the zero line, positive pole and second diode of the 3rd electric capacity C3
VD2 negative pole connection, and be connected with the power down optocoupler drive circuit；
The positive pole of the second diode VD2 is connected with the first end of the 3rd resistor R3；The second of the 3rd resistor R3
End is connected with the first end of the second electric capacity C2, and is connected with the negative pole of the 3rd diode VD3, the 3rd diode
VD3 positive pole is connected with the zero line；
The second end of the second electric capacity C2 is connected with the halfwave rectifier sample circuit.
7. AC dump warning circuit according to claim 6, it is characterised in that the second electric capacity C2 is energy storage electricity
Hold, the second diode VD2 and the 3rd diode VD3 are commutation diode, and the 3rd resistor R3 is current-limiting resistance.
8. AC dump warning circuit according to claim 1, it is characterised in that the power down optocoupler drive circuit bag
Include：Transistor VT1, the 4th resistance R4, the 5th resistance R5, optocoupler N1；
The emitter stage of the transistor VT1 is connected with the zero line, colelctor electrode and the light of the transistor VT1
Coupling N1 first end connection, the base stage of the transistor VT1 is connected with the first end of the 4th resistance R4；
The second end of the optocoupler N1 is connected with the first end of the 5th resistance R5, the second end of the 4th resistance R4 and institute
State the connection of halfwave rectifier sample circuit；
The second end of the 5th resistance R5 is connected with the halfwave rectifier voltage-multiplying circuit；
The 3rd end of the optocoupler N1 is connected with the alarm signal output circuit, the 4th end ground connection of the optocoupler N1；
Wherein, the transistor VT1 is turned in normal input voltage, and drives the optocoupler N1 to turn on；The crystal
Triode VT1 is turned off after input voltage disconnection, and the optocoupler N1 is not turned on.
9. AC dump warning circuit according to claim 8, it is characterised in that the power down optocoupler drive circuit is also wrapped
Voltage-regulator diode VZ1 is included, the positive pole of the voltage-regulator diode VZ1 is connected with the zero line, the negative pole of the voltage-regulator diode VZ1
It is connected with the second end of the 5th resistance R5；The voltage-regulator diode VZ1 is protection device.
10. AC dump warning circuit according to claim 8, it is characterised in that the alarm signal output circuit bag
Include：6th resistance R6, signal output part；
The first end of the 6th resistance R6 and the three-terminal link of the optocoupler N1, and be connected with the signal output part, institute
The second end for stating the 6th resistance R6 is connected with external power supply；
The 6th resistance R6 is current-limiting resistance；
The signal output part is used to send alarm signal when the optocoupler N1 is not turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089562.7U CN206557275U (en) | 2017-01-23 | 2017-01-23 | A kind of AC dump warning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089562.7U CN206557275U (en) | 2017-01-23 | 2017-01-23 | A kind of AC dump warning circuit |
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| CN206557275U true CN206557275U (en) | 2017-10-13 |
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| CN201720089562.7U Expired - Fee Related CN206557275U (en) | 2017-01-23 | 2017-01-23 | A kind of AC dump warning circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109979512A (en) * | 2019-04-28 | 2019-07-05 | 浙江万松电气有限公司 | The circuit and method that power down Flash is saved are realized in the embedded system powered by linear power supply |
| CN110058074A (en) * | 2019-04-30 | 2019-07-26 | 烽火通信科技股份有限公司 | A kind of power failure warning circuit and its control method |
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| CN113917219A (en) * | 2021-10-08 | 2022-01-11 | 广东电网有限责任公司东莞供电局 | Automatic detection alarm device |
-
2017
- 2017-01-23 CN CN201720089562.7U patent/CN206557275U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109979512A (en) * | 2019-04-28 | 2019-07-05 | 浙江万松电气有限公司 | The circuit and method that power down Flash is saved are realized in the embedded system powered by linear power supply |
| CN110058074A (en) * | 2019-04-30 | 2019-07-26 | 烽火通信科技股份有限公司 | A kind of power failure warning circuit and its control method |
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| CN113917219A (en) * | 2021-10-08 | 2022-01-11 | 广东电网有限责任公司东莞供电局 | Automatic detection alarm device |
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Granted publication date: 20171013 Termination date: 20210123 |