CN208224355U - A kind of alternating current undervoltage detection warning circuit - Google Patents
A kind of alternating current undervoltage detection warning circuit Download PDFInfo
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- CN208224355U CN208224355U CN201820929416.5U CN201820929416U CN208224355U CN 208224355 U CN208224355 U CN 208224355U CN 201820929416 U CN201820929416 U CN 201820929416U CN 208224355 U CN208224355 U CN 208224355U
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Abstract
The utility model relates to alternating current techniques fields, a kind of alternating current undervoltage detection warning circuit, including single-chip microcontroller, warning circuit, the first current rectifying and wave filtering circuit, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitor C3, controllable accurate source of stable pressure TL431, opto-coupler chip, common mode inductance, capacitor C4 and the second current rectifying and wave filtering circuit are provided.The utility model, which solves existing mains AC, can not know when under-voltage in time so that electrical equipment is damaged the problems such as reducing electrical equipment service life.
Description
Technical field
The utility model relates to alternating current techniques field, in particular to a kind of alternating current undervoltage detection warning circuit.
Background technique
Alternating current input is core that electric appliance uses, the stabilization of alternating current voltage be electric appliance can normal use it is important before
It mentions.The normal voltage of the AC power source of China is 220V, its maximum allowable offset range is 187~240V, is permitted more than this
Perhaps range will cause damages to electrical equipment, be unfavorable for extending the service life of electrical equipment, cause cost excessively high.Thus urgently
One kind to be developed, which can press mains AC, carries out the friendship that real-time tracking detection timely and accurately judges alternating voltage input condition
Galvanic electricity undervoltage detection warning circuit to make movement response in alternating voltage under-voltage first time, and then is effectively protected
The normal work and people's security of the lives and property of electric appliance.
Utility model content
Therefore, it for above-mentioned problem, is owed the utility model proposes a kind of real-time detection alternating current voltage and to alternating current
Press the alternating current undervoltage detection warning circuit for electrical equipment service life of being alarmed, extended.
To solve this technical problem, the utility model takes following scheme: a kind of alternating current undervoltage detection warning circuit, packet
Include single-chip microcontroller, warning circuit, the first current rectifying and wave filtering circuit, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6,
Resistance R7, capacitor C3, controllable accurate source of stable pressure TL431, opto-coupler chip, common mode inductance, capacitor C4 and the second current rectifying and wave filtering circuit,
The first current rectifying and wave filtering circuit input terminal is connected with mains AC, and the one end the resistance R1 is connected with the one end resistance R2
It connects, the resistance R1 other end is connected with the one end resistance R4 and the first rectification filter circuit output end anode, the resistance R2
The other end is connected with the end REF of the one end resistance R3, the one end capacitor C3 and controllable accurate source of stable pressure TL431 respectively, the resistance
R3 other end ground connection, the resistance R4 other end is connected with the one end resistance R5, the resistance R5 other end respectively with resistance R6
One end is connected with the first pin of common mode inductance, the resistance R6 other end, the capacitor C3 other end and controllable accurate source of stable pressure
The end A of TL431 is grounded, and the end K of the controllable accurate source of stable pressure TL431 is connected with the second pin of common mode inductance, described
The third pin of common mode inductance is connected with the luminous tube positive terminal of the one end capacitor C4 and opto-coupler chip respectively, the common mode inductance
The 4th pin be connected respectively with the luminous tube negative pole end of the capacitor C4 other end and opto-coupler chip, the current collection of the opto-coupler chip
Pole is connected through resistance R7 with the end DC power supply VCC, and the emitter of the opto-coupler chip is through the second current rectifying and wave filtering circuit and monolithic
The P1.3 pin of machine is connected, and the P1.6 pin of the single-chip microcontroller is connected with the control terminal of warning circuit.
Further to improve, second current rectifying and wave filtering circuit includes resistance R8, capacitor C5 and capacitor C6, the resistance R8
One end is connected with the P1.3 pin of the emitter of opto-coupler chip, the one end capacitor C5, the one end capacitor C6 and single-chip microcontroller, the resistance
The R8 other end, the capacitor C5 other end and the capacitor C6 other end are grounded.
Further to improve, the single-chip microcontroller is STM32F103C8T6 chip.
By using preceding solution, the beneficial effects of the utility model are: by the way that mains AC is whole through first
Flowing the boosting of filter circuit rectifying and wave-filtering is 320V, then two-way is divided to be shunted, and passes through resistance R1, resistance R2, resistance R3 all the way
Series connection ground connection is followed by the REF of controllable accurate source of stable pressure T431 by the connection A point between resistance R2 and resistance R3 through capacitor C3 filtering
End makes the voltage for connecting A point 2.5V when alternating current inputs 187V by adjusting resistance R1, resistance R2, resistance R3；Another way is logical
Resistance RD4, RD5, RD2 series connection ground connection are crossed, is connected by the first pin of connection B point and common mode inductance between resistance R5 and resistance R6
It connects, makes to connect B point voltage 5V by adjusting resistance R4, resistance R5, resistance R6, through common mode inductance T3, capacitor C4, opto-coupler chip
Luminous tube be connected with the end K of controllable accurate source of stable pressure TL431, the end A of controllable accurate source of stable pressure TL431 ground connection, when alternating current is defeated
When entering voltage and being down to 187V or less, the voltage of sampling voltage connection A point will be less than 2.5V, and the voltage of B point is also slightly below 5V, this
When, the voltage of connection A point is less than the reference voltage 2.5V of controllable accurate source of stable pressure TL431, and controllable accurate source of stable pressure TL431 is in
Off state, and then opto-coupler chip is also at off state, so that single-chip microcontroller receives low level signal, single-chip microcontroller receives low level
Signal is immediately controlled warning circuit and issues failure under-voltage acousto-optic alarm signal, and common mode inductance plays a role of anti-interference, can inhibit
Interference from alternating current common-mode signal；Capacitor C4 plays the role of buffer current protection opto-coupler chip；So that ought examine in real time
It is under-voltage to alternating current when measuring alternating current voltage lower than 187V to alarm, stop alarm when back to normal, so that user is timely
Electrical equipment is stopped using, damage of the low pressure to electrical equipment is avoided, protection extends the service life of electrical equipment, can push away extensively
Wide application.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model embodiment.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
With reference to Fig. 1, the alternating current undervoltage detection warning circuit of preferred the utility model, including single-chip microcontroller 1, warning circuit
2, the first current rectifying and wave filtering circuit 3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitor C3,
Controllable accurate source of stable pressure TL431, opto-coupler chip 6, common mode inductance 5, capacitor C4 and the second current rectifying and wave filtering circuit 4, described first is whole
Stream 3 input terminal of filter circuit is connected with mains AC, and the one end the resistance R1 is connected with the one end resistance R2, the resistance
The R1 other end is connected with the one end resistance R4 and the first rectification filter circuit output end anode, the resistance R2 other end respectively with
The one end resistance R3, the one end capacitor C3 are connected with the end REF of controllable accurate source of stable pressure TL431, the resistance R3 other end ground connection,
The resistance R4 other end is connect jointly with two filter capacitors C1, C2 of the one end resistance R5 and the first current rectifying and wave filtering circuit 3
End is connected, and two filter capacitor C1, C2 common connection ends of the resistance R4 other end and the first current rectifying and wave filtering circuit 3 make disconnected
It can accelerate the velocity of discharge of filter capacitor C1, C2 when electric, and then improve the service life of component, the resistance R5 other end
It is connected respectively with the one end resistance R6 and 5 first pin of common mode inductance, the resistance R6 other end, the capacitor C3 other end and controllable
The end A of precision voltage regulator TL431 is grounded, the end K of the controllable accurate source of stable pressure TL431 and the second pin of common mode inductance 5
It is connected, the third pin of the common mode inductance 5 is connected with the luminous tube positive terminal of the one end capacitor C4 and opto-coupler chip 6 respectively
It connecing, the 4th pin of the common mode inductance 5 is connected with the luminous tube negative pole end of the capacitor C4 other end and opto-coupler chip 6 respectively,
The collector of the opto-coupler chip 6 is connected through resistance R7 with the end DC power supply VCC, and second current rectifying and wave filtering circuit 4 includes
The emitter of resistance R8, capacitor C5 and capacitor C6, the one end the resistance R8 and opto-coupler chip 6, the one end capacitor C5, the one end capacitor C6
It is connected with the P1.3 pin of single-chip microcontroller 1, the resistance R8 other end, the capacitor C5 other end and the capacitor C6 other end are grounded,
The P1.6 pin of the single-chip microcontroller 1 is connected with the control terminal of warning circuit, and the single-chip microcontroller 1 is STM32F103C8T6 chip,
The alarm module chip model of warning circuit 2 is LM386 chip.
The utility model is then divided by boosting mains AC through the first current rectifying and wave filtering circuit rectifying and wave-filtering for 320V
Two-way is shunted, all the way by resistance R1, resistance R2, resistance R3 series connection ground connection, by the connection A between resistance R2 and resistance R3
Point is followed by the end REF of controllable accurate source of stable pressure T431 through capacitor C3 filtering, makes to connect by adjusting resistance R1, resistance R2, resistance R3
The voltage for connecing A point is 2.5V when alternating current inputs 187V；Another way is by resistance RD4, RD5, RD2 series connection ground connection, by resistance R5
First pin of connection B point and common mode inductance between resistance R6 connects, and is made by adjusting resistance R4, resistance R5, resistance R6
Connection B point voltage be 5V, through common mode inductance T3, capacitor C4, opto-coupler chip luminous tube and controllable accurate source of stable pressure TL431 K
End is connected, the end the A ground connection of controllable accurate source of stable pressure TL431, when 187V or less is down in mains input voltage, sampling voltage connection
The voltage of A point will be less than 2.5V, and the voltage of B point is also slightly below 5V, at this point, the voltage of connection A point is less than controllable accurate source of stable pressure
The reference voltage 2.5V of TL431, controllable accurate source of stable pressure TL431 are in off state, and then opto-coupler chip is also at cut-off shape
State, so that single-chip microcontroller receives low level signal, single-chip microcontroller receives low level signal and warning circuit is immediately controlled to issue failure under-voltage
Sound and light alarm signal, common mode inductance play a role of anti-interference, and can inhibit the interference from alternating current common-mode signal；Capacitor C4 is played
The effect of buffer current protection opto-coupler chip；So that being owed when real-time detection to alternating current voltage is lower than 187V to alternating current
Pressure is alarmed, and stop alarm when back to normal avoids low pressure to electrical equipment so that user stops using electrical equipment in time
Damage, protection extend electrical equipment service life, can wide popularization and application.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details
On the utility model can be made a variety of changes, be the protection scope of the utility model.
Claims (3)
1. a kind of alternating current undervoltage detection warning circuit, including single-chip microcontroller, warning circuit, the first current rectifying and wave filtering circuit, resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitor C3, controllable accurate source of stable pressure TL431, optocoupler core
Piece, common mode inductance, capacitor C4 and the second current rectifying and wave filtering circuit, it is characterised in that: the first current rectifying and wave filtering circuit input terminal with
Mains AC is connected, and the one end the resistance R1 is connected with the one end resistance R2, the resistance R1 other end and resistance R4 mono-
End be connected with the first rectification filter circuit output end anode, the resistance R2 other end respectively with the one end resistance R3, capacitor C3
One end is connected with the end REF of controllable accurate source of stable pressure TL431, the resistance R3 other end ground connection, the resistance R4 other end
It is connected with the one end resistance R5, the resistance R5 other end is connected with the one end resistance R6 and the first pin of common mode inductance respectively,
The end A of the resistance R6 other end, the capacitor C3 other end and controllable accurate source of stable pressure TL431 is grounded, and the controllable accurate is steady
The end K of potential source TL431 is connected with the second pin of common mode inductance, the third pin of the common mode inductance respectively with capacitor C4 mono-
End be connected with the luminous tube positive terminal of opto-coupler chip, the 4th pin of the common mode inductance respectively with the capacitor C4 other end and light
The luminous tube negative pole end of coupling chip is connected, and the collector of the opto-coupler chip is connected through resistance R7 with the end DC power supply VCC,
The emitter of the opto-coupler chip is connected through the second current rectifying and wave filtering circuit with the P1.3 pin of single-chip microcontroller, the single-chip microcontroller
P1.6 pin is connected with the control terminal of warning circuit.
2. alternating current undervoltage detection warning circuit according to claim 1, it is characterised in that: the second rectifying and wave-filtering electricity
Road includes resistance R8, capacitor C5 and capacitor C6, emitter, the one end capacitor C5, capacitor of the one end the resistance R8 and opto-coupler chip
The one end C6 is connected with the P1.3 pin of single-chip microcontroller, and the resistance R8 other end, the capacitor C5 other end and the capacitor C6 other end are equal
Ground connection.
3. alternating current undervoltage detection warning circuit according to claim 1, it is characterised in that: the single-chip microcontroller is
STM32F103C8T6 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820929416.5U CN208224355U (en) | 2018-06-15 | 2018-06-15 | A kind of alternating current undervoltage detection warning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820929416.5U CN208224355U (en) | 2018-06-15 | 2018-06-15 | A kind of alternating current undervoltage detection warning circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208224355U true CN208224355U (en) | 2018-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820929416.5U Expired - Fee Related CN208224355U (en) | 2018-06-15 | 2018-06-15 | A kind of alternating current undervoltage detection warning circuit |
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| CN (1) | CN208224355U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077930A (en) * | 2019-12-17 | 2020-04-28 | 太原航空仪表有限公司 | Energy storage circuit power failure monitoring trigger circuit |
| CN112285591A (en) * | 2020-06-09 | 2021-01-29 | 许继集团有限公司 | Multi-path direct-current power supply voltage detection control device |
-
2018
- 2018-06-15 CN CN201820929416.5U patent/CN208224355U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077930A (en) * | 2019-12-17 | 2020-04-28 | 太原航空仪表有限公司 | Energy storage circuit power failure monitoring trigger circuit |
| CN112285591A (en) * | 2020-06-09 | 2021-01-29 | 许继集团有限公司 | Multi-path direct-current power supply voltage detection control device |
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| GR01 | Patent grant | ||
| 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: 20181211 Termination date: 20210615 |