CN204789859U - Mutual -inductor state detection circuitry - Google Patents
Mutual -inductor state detection circuitry Download PDFInfo
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- CN204789859U CN204789859U CN201520546193.0U CN201520546193U CN204789859U CN 204789859 U CN204789859 U CN 204789859U CN 201520546193 U CN201520546193 U CN 201520546193U CN 204789859 U CN204789859 U CN 204789859U
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Abstract
The utility model discloses a mutual -inductor state detection circuitry aims at providing the mutual -inductor state detection circuitry of an energy -conservation, stability, low -power consumption, and it is great to have solved the detection circuitry consumption, and the work load quantitative change of MCU element circuit is big, and the circuit generates heat easily, and influence stability, its technical scheme main points are control signal that delay circuit output is interrupted, switch circuit has sense terminal, control end and output, the sense terminal is coupled the mutual -inductor link for receiving detection signal, the control end is coupled delay circuit, switch circuit is used for receiving control signal and responds control signal realizing the feedback to the detected signal to carry sampled signal to the control unit from the output. Stable, energy -conserving effect has been reached. The utility model is suitable for an electric fire detection circuitry technical field.
Description
Technical field
The utility model relates to a kind of electrical fire monitoring device technical field, and more particularly, it relates to a kind of mutual inductor state detection circuit.
Background technology
Along with society progressively deepens the understanding that electrical fire is taken precautions against, current existing electric fire alarm series products also gets more and more, residual electricity streaming mutual inductor is adopted in prior art, and mutual inductor is connected to alarm main circuit by two wires to carry out work, in the process of long-term use, easily occur that mutual inductor short circuit or open circuit damage or connect the abnormal situation such as wire short circuit or disconnection, although alarm will be caused so normally to work, but due to exception or the damage of mutual inductor, cause alarm correctly cannot detect the ability of electrical fire, if the problem of mutual inductor can not be got rid of in time, very large hidden danger is brought with regard to giving the strick precaution of electrical fire.
At present, application number is the detector circuit that the Chinese patent of CN201520075179.7 discloses the external mutual inductor of a kind of automatic detection, disclose a kind of mutual inductor testing circuit, the little current signal that the residual current data detected can be converted in proportion when residual electricity streaming mutual inductor is normal, through amplitude limiter circuit and the resistance R201 of the composition of diode D1, D2, convert voltage signal to, send into residual current treatment circuit, make further data processing; By calculating, MCU element circuit relatively judges whether mutual inductor exists exception.If it is abnormal that MCU element circuit judges that mutual inductor exists, by controlling pin, high level will be exported to resistance R216, making triode Q201 conducting; Because the collector of Q201 is connected with VCC, such VCC voltage by resistance R218, will enter transducer signal input circuit, and MCU element circuit, by gathering residual current data, judges the duty of mutual inductor further.This circuit realiration state-detection of mutual inductor, but this circuit is because long-term work is at detected state, makes the working load quantitative change of MCU element circuit large, thus improves the power consumption of MCU unit, circuit is easily generated heat, affect stability.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of mutual inductor state detection circuit of energy-conservation, stable, low-power consumption.
1. for achieving the above object, the utility model provides following technical scheme: a kind of mutual inductor state detection circuit, comprises mutual inductor link, also comprises delay circuit, on-off circuit and control module;
Described delay circuit exports the control signal of being interrupted;
Described on-off circuit has test side, control end and output terminal, described test side couples mutual inductor link in order to receive detection signal, described control end couples delay circuit, sampled signal in order to reception control signal and responsive control signal export sampled signal, and is delivered to control module from output terminal by described on-off circuit.
Preferably, described on-off circuit comprises the 4th resistance, the 3rd resistance, the 5th resistance and NPN triode;
One end of described 3rd resistance is control end, and the other end is connected with the base stage of NPN triode;
One end of described 4th resistance connects a power supply, and the other end is output terminal and is connected with the collector of NPN triode;
Ground connection after emitter series connection the 5th resistance of described NPN triode, the two ends of described 5th resistance are test side.
Preferably, described delay circuit comprises 555 chips, the first resistance, the second resistance, the first diode, the second diode, the first electric capacity and the second electric capacity; 4th pin of described first resistance one end, 555 chips is connected power supply with the 8th pin, be connected with the negative electrode of the second diode after described second resistant series first resistance, the anode of the second diode connects first electric capacity one end, 555 chips the 6th pin, 555 chip second pins and the first diode cathode, the anode of the first diode connects 555 chips the 7th pin, first pin ground connection of described 555 chips, 5th house keeper is by the second capacity earth, the other end ground connection of the first electric capacity, the three-prong of described 555 chips exports the control signal of being interrupted.
Preferably, described delay circuit also comprises potentiometer, and the adjustable side of described potentiometer is coupled to the 7th pin of 555 chips, and the resistance two ends of described potentiometer are series between the first resistance and the second resistance.
Compared with prior art, the beneficial effects of the utility model are: the control signal of the interruption exported by delay circuit carrys out gauge tap circuit, realize discontinuity mutual inductor is detected, when control signal is high level, make on-off circuit can realize detecting mutual inductor, from the low and high level of on-off circuit output pin, the connection status of mutual inductor can judge that whether mutual inductor is normal, each detection is all detect one end, interval time, thus can the loss of power be avoided, and, for control module, also certain buffer action is played, carry out detecting the state of mutual inductor without the moment, the power consumption of control module can be reduced, make circuit more stable, and the energy loss decreased when some detect, make circuit more energy-conservation.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model mutual inductor state detection circuit embodiment one;
Fig. 2 is the circuit diagram of the utility model mutual inductor state detection circuit embodiment two.
A1, delay circuit in figure; A2, on-off circuit; CT, mutual inductor link; U1, control module; R1, the first resistance; R2, the second resistance; R3, the 3rd resistance; R4, the 4th resistance; R5, the 5th resistance; Q1, NPN triode; D1, the first diode; D2, the second diode; C1, the first electric capacity; C2, the second electric capacity.
Embodiment
Referring to figs. 1 through Fig. 2, the utility model mutual inductor state detection circuit embodiment is described further.
As shown in Figure 1, mutual inductor state detection circuit, comprises mutual inductor link CT, also comprises delay circuit A1, on-off circuit A2 and control module U1; Control module U1 is conventional single-chip microcomputer of the prior art, and the single-chip microcomputer that the present embodiment uses is 89S51 single-chip microcomputer, also can be 89C52 single-chip microcomputer.Described delay circuit A1 exports the control signal of being interrupted; Described on-off circuit A2 has test side, control end and output terminal, described test side couples mutual inductor link CT in order to receive detection signal, described control end couples delay circuit A1, described on-off circuit A2 is in order to reception control signal and responsive control signal realizes feedback to detection signal, and sampled signal is delivered to control module U1 from output terminal.The control signal of the interruption exported by delay circuit A1 carrys out gauge tap circuit A2, realize discontinuity mutual inductor is detected, when control signal is high level, make on-off circuit A2 can realize detecting mutual inductor, from the low and high level of on-off circuit A2 output pin, the connection status of mutual inductor can judge that whether mutual inductor is normal, each detection is all detect one end, interval time, thus can the loss of power be avoided, and, for control module U1, also certain buffer action is played, carry out detecting the state of mutual inductor without the moment, the power consumption of control module U1 can be reduced, make circuit more stable, and the energy loss decreased when some detect, make circuit more energy-conservation.
Embodiment one: on-off circuit A2 comprises the 4th resistance R4, the 3rd resistance R3, the 5th resistance R5 and NPN triode Q1; One end of described 3rd resistance R3 is control end, and the other end is connected with the base stage of NPN triode Q1; One end of described 4th resistance R4 connects a power supply, and the other end is output terminal and is connected with the collector of NPN triode Q1; Ground connection after emitter series connection the 5th resistance R5 of described NPN triode Q1, the two ends of described 5th resistance R5 are test side.When delay circuit A1 exports high level, triode saturation conduction, start to detect mutual inductor connection status, judge that flow process is within the 100ms starting to detect, if output terminal is low level, mutual inductor short circuit is described, otherwise again detects output level after 100ms, if for low level illustrates normal connection, otherwise represent mutual inductor open circuit.Time is adjustable, this be one preferred embodiment.The level signal exported by output terminal, to after single-chip microcomputer, effectively can detect the connection status of mutual inductor.The mutual inductor of this circuit can be current transformer and voltage transformer (VT), preferably current transformer in this embodiment.Owing to using current transformer, and can be connected directly between on the 5th resistance R5, effectively reduce the use of commutation diode relative to documents, vigour part be reduced, and reduces cost.
Delay circuit A1 comprises 555 chips, the first resistance R1, the second resistance R2, the first diode D1, the second diode D2, the first electric capacity C1 and the second electric capacity C2, described first resistance R1 one end, 4th pin of 555 chips is connected power supply with the 8th pin, 7th pin is connected between the first resistance R1 and the second resistance R2, described second resistance R2 connects after the first resistance R1 and is connected with the negative electrode of the second diode D2, the anode of the second diode D2 connects first electric capacity C1 one end, 555 chips the 6th pin, 555 chip second pins and the first diode D1 negative electrode, the anode of the first diode D1 connects 555 chips the 7th pin, first pin ground connection of described 555 chips, 5th house keeper is by the second electric capacity C2 ground connection, the other end ground connection of the first electric capacity C1, the three-prong of described 555 chips exports the control signal of being interrupted.Delay circuit A1 adopts 555 chips and peripheral circuit, makes the with low cost of chip, easy to use, and can control output low and high level thus make control signal be low level to be do not carry out detection, saves energy, reduces power consumption.
Delay circuit A1 is formed by 555 timers, R1, R2 and C1 are external timing elements, in circuit, high level trigger end (6 pin) and low level trigger end (2 pin) are received the junction of R2 and C1 by D2 after connecing, discharge end (7 pin) is received R1, the connected node place of R2.
Owing to switching on power moment, electric capacity C1 has little time charging, and capacitor C1 both end voltage is low level, is less than (1/3) Vcc, therefore high level trigger end and low level trigger end are low level, and three-prong exports as high level, the discharge tube cut-off of 555 chip internals.At this moment, power supply is through R1, R2 charges to electric capacity C1, voltage capacitor C1 is made exponentially to increase, when electric capacity C1 voltage rise is to (2/3) Vcc, exports three-prong and export as low level, the discharge tube conducting of 555 chip internals, the voltage of electric capacity C1 from (1/3) Vcc rise to (2/3) Vcc during this period of time in the state of circuit call the first temporary stable state, the length of its TPH that holds time is relevant with the duration of charging of electric capacity.Charging rate T fills=(R1+R2) C1.
Embodiment two: delay circuit A1 also comprises potentiometer, the adjustable side of described potentiometer is coupled to the 7th pin of 555 chips, and the resistance two ends of described potentiometer are series between the first resistance R1 and the second resistance R2.Implement principle identical with embodiment one, just can the time length of control signal of regulation output by potentiometer, thus the frequency of detection can be regulated easily.
The above is only preferred implementation of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (4)
1. a mutual inductor state detection circuit, comprises mutual inductor link, it is characterized in that: also comprise delay circuit, on-off circuit and control module;
Described delay circuit exports the control signal of being interrupted;
Described on-off circuit has test side, control end and output terminal, described test side couples mutual inductor link in order to receive detection signal, described control end couples delay circuit, sampled signal in order to reception control signal and responsive control signal export sampled signal, and is delivered to control module from output terminal by described on-off circuit.
2. mutual inductor state detection circuit according to claim 1, is characterized in that: described on-off circuit comprises the 4th resistance, the 3rd resistance, the 5th resistance and NPN triode;
One end of described 3rd resistance is control end, and the other end is connected with the base stage of NPN triode;
One end of described 4th resistance connects a power supply, and the other end is output terminal and is connected with the collector of NPN triode;
Ground connection after emitter series connection the 5th resistance of described NPN triode, the two ends of described 5th resistance are test side.
3. mutual inductor state detection circuit according to claim 1 and 2, is characterized in that: described delay circuit comprises 555 chips, the first resistance, the second resistance, the first diode, the second diode, the first electric capacity and the second electric capacity; 4th pin of described first resistance one end, 555 chips is connected power supply with the 8th pin, be connected with the negative electrode of the second diode after described second resistant series first resistance, the anode of the second diode connects first electric capacity one end, 555 chips the 6th pin, 555 chip second pins and the first diode cathode, the anode of the first diode connects 555 chips the 7th pin, first pin ground connection of described 555 chips, 5th house keeper is by the second capacity earth, the other end ground connection of the first electric capacity, the three-prong of described 555 chips exports the control signal of being interrupted.
4. mutual inductor state detection circuit according to claim 3, it is characterized in that: described delay circuit also comprises potentiometer, the adjustable side of described potentiometer is coupled to the 7th pin of 555 chips, and the resistance two ends of described potentiometer are series between the first resistance and the second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520546193.0U CN204789859U (en) | 2015-07-25 | 2015-07-25 | Mutual -inductor state detection circuitry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520546193.0U CN204789859U (en) | 2015-07-25 | 2015-07-25 | Mutual -inductor state detection circuitry |
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| CN204789859U true CN204789859U (en) | 2015-11-18 |
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| CN201520546193.0U Expired - Fee Related CN204789859U (en) | 2015-07-25 | 2015-07-25 | Mutual -inductor state detection circuitry |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390141A (en) * | 2017-09-07 | 2017-11-24 | 国网辽宁省电力有限公司 | A kind of current transformer detection means and method suitable for distributed generator islanding detection |
| CN109932673A (en) * | 2017-12-19 | 2019-06-25 | 上海亿盟电气自动化技术有限公司 | A kind of transformer disconnection detection circuit of breaker |
-
2015
- 2015-07-25 CN CN201520546193.0U patent/CN204789859U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390141A (en) * | 2017-09-07 | 2017-11-24 | 国网辽宁省电力有限公司 | A kind of current transformer detection means and method suitable for distributed generator islanding detection |
| CN109932673A (en) * | 2017-12-19 | 2019-06-25 | 上海亿盟电气自动化技术有限公司 | A kind of transformer disconnection detection circuit of breaker |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20200725 |
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| CF01 | Termination of patent right due to non-payment of annual fee |