CN206865124U - Low voltage cutoff circuit and low-pressure alarming device - Google Patents

Abstract

The utility model provides a kind of low voltage cutoff circuit and low-pressure alarming device, is related to electricity system field.The low voltage cutoff circuit includes low power consumption voltage detection chip and switch module, the input of low power consumption voltage detection chip and a power electric connection, the output end of low power consumption voltage detection chip electrically connects with switch module, low power consumption voltage detection chip is used for the voltage for detecting power supply, judge the voltage of power supply threshold voltage whether pre-stored less than low power consumption voltage detection chip, if it is, controlling switch component disconnects.Low voltage cutoff circuit provided by the utility model has the advantages of low in energy consumption, can to protect electricity system with low-pressure alarming device.

Description

Low voltage cutoff circuit and low-pressure alarming device

Technical field

Electricity system field is the utility model is related to, is filled in particular to a kind of low voltage cutoff circuit and low pressure alarming Put.

Background technology

At present, intelligent gas meter has all been used by most of families, and oneself remaining combustion can be viewed by intelligent gas meter The information such as tolerance.Also, because lithium Asia battery has the advantages that voltage accuracy is high good with high temperature performance, so typically adopting at present It is that intelligent gas meter is powered with lithium Asia battery.

In the latter stage that battery uses in lithium Asia, due to powering quantity deficiency, circuit may be caused unstable so that whole intelligence Gas meter, flow meter system is unstable, so as to cause the loss of the data of intelligent gas meter system, it could even be possible to infringement intelligent gas meter System.

How to solve the above problems, be the emphasis of those skilled in the art's concern.

Utility model content

The purpose of this utility model is to provide a kind of low voltage cutoff circuit and low-pressure alarming device, to solve prior art Middle battery causes intelligent gas meter the problem of stability, reliability is poor occur when electricity exhausts soon.

What the utility model was realized in：

On the one hand, this implementation new embodiment provides a kind of low voltage cutoff circuit, and the low voltage cutoff circuit includes low Power consuming voltage detection chip and switch module, the input and a power electric connection of the low power consumption voltage detection chip are described The output end of low power consumption voltage detection chip electrically connects with the switch module, and the low power consumption voltage detection chip is used to detect The voltage of the power supply, judge whether the voltage of the power supply is electric less than the threshold value that the low power consumption voltage detection chip is pre-stored Pressure, if it is, controlling the switch module to disconnect.

Further, the model U1XC61CN3002MR of low power consumption voltage detection chip voltage checking chip.

Further, the low voltage cutoff circuit also includes anti-reverse diode, the positive pole of the anti-reverse diode with The positive pole electrical connection of the power supply, the negative pole of the anti-reverse diode respectively with the switch module, the low power consumption voltage The input electrical connection of detection chip.

Further, the switch module includes the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor and institute The output end electrical connection of low power consumption voltage detection chip is stated, the source electrode of first metal-oxide-semiconductor electrically connects with common port, and described first The drain electrode of metal-oxide-semiconductor electrically connects with the grid of second metal-oxide-semiconductor, the source electrode of second metal-oxide-semiconductor and the anti-reverse diode Negative pole electrical connection.

Further, the low voltage cutoff circuit also includes first resistor, one end of the first resistor and the counnter attack The negative pole electrical connection of diode is connect, the other end of the first resistor electrically connects with the drain electrode of first metal-oxide-semiconductor.

Further, the low voltage cutoff circuit also includes 3rd resistor, one end of the 3rd resistor and the low work( The output end electrical connection of voltage checking chip is consumed, the other end of the 3rd resistor electrically connects with the grid of first metal-oxide-semiconductor.

Further, the low voltage cutoff circuit also includes the 4th resistance, and one end of the 4th resistance is used for described the The other end electrical connection of three resistance, the other end of the 4th resistance electrically connect with common port.

Further, the low voltage cutoff circuit also includes second resistance, one end of the second resistance and the low work( The output end electrical connection of voltage checking chip is consumed, the negative pole of the other end of the second resistance and the anti-reverse diode is electrically connected Connect.

Further, the low voltage cutoff circuit also includes electric capacity, and one end of the electric capacity is examined with the low power consumption voltage The input electrical connection of chip is surveyed, the other end of the electric capacity electrically connects with common port.

On the other hand, the utility model additionally provides a kind of low-pressure alarming device low-pressure alarming device, the low pressure alarming Device low-pressure alarming device includes control board and low voltage cutoff circuit, and the low voltage cutoff circuit is examined including low power consumption voltage Survey chip and switch module, the input and a power electric connection of the low power consumption voltage detection chip, the low power consumption voltage The output end of detection chip electrically connects with the switch module, and the low power consumption voltage detection chip is used to detect the power supply Voltage, judge the voltage of power supply threshold voltage whether pre-stored less than the low power consumption voltage detection chip, if it is, The switch module is then controlled to disconnect, the control board is disposed with controller and signal transmitting unit, the controller point Do not electrically connected with the low power consumption voltage detection chip, the signal transmitting unit, the controller be used for receive it is described Alarm signal is generated after the low level that low power consumption voltage detection chip is sent, and the alarm signal is transmitted to the signal and sent out Unit is sent, the signal transmitting unit is used to send the alarm signal received to an intelligent terminal.

Compared with the prior art, the utility model has the advantages that：

The utility model provides a kind of low voltage cutoff circuit, and the low voltage cutoff circuit includes low power consumption voltage detection core Piece and switch module.On the one hand, when the electricity of power supply will exhaust, the voltage of power supply output reduces, and low power consumption voltage detects Chip is able to detect that the voltage of power supply.When the discharge voltage of power supply is normal, low power consumption voltage detection chip can export high electricity It is flat, turn on switch module, so as to be system power supply；When electric quantity of power supply will exhaust, electric power output voltage reduces, now electric Detection module output low level is pressed, disconnects switch module, so as to be system power supply.Due to power supply output voltage not When stationary phase is only present in electric quantity of power supply and will exhausted, i.e., by setting low voltage cutoff circuit, electric power output voltage can be prevented Amphibolia appearance, so as to improve the stability of system, reliability and Information Security.Second aspect, due to this The low power consumption voltage detection chip that utility model uses for low-power consumption low power consumption voltage detection chip so that low power consumption voltage examine It is smaller to survey the power consumption of chip, so as to add the service life of power supply, reduces use cost.

To enable above-mentioned purpose of the present utility model, feature and advantage to become apparent, preferred embodiment cited below particularly, and Accompanying drawing appended by cooperation, is described in detail below.

Brief description of the drawings

It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Generally here described in accompanying drawing and The component of the utility model embodiment shown can be configured to arrange and design with a variety of.Therefore, below to attached The detailed description of the embodiment of the present utility model provided in figure is not intended to limit claimed the scope of the utility model, But it is merely representative of selected embodiment of the present utility model.Based on the embodiment in the utility model, ordinary skill people The every other embodiment that member is obtained under the premise of creative work is not made, belong to the model of the utility model protection Enclose.

Fig. 1 shows the circuit connection diagram for the low voltage cutoff circuit that the utility model first embodiment is provided.

Fig. 2 shows the input for the low power consumption voltage detection chip that the utility model first embodiment is provided, output The circuit connection diagram at end.

Fig. 3 shows that the circuit for the low-pressure alarming device low-pressure alarming device that the utility model second embodiment is provided connects Connect block diagram.

What Fig. 4 showed low-pressure alarming device that the utility model second embodiment provided and intelligent terminal interacts signal Figure.

Icon：100- low voltage cutoff circuits；200- low-pressure alarming devices；210- control boards；211- controllers；212- Signal transmitting unit；300- networks；400- intelligent terminals.

Embodiment

Below in conjunction with accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear Chu, it is fully described by, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole realities Apply example.The component of the utility model embodiment being generally described and illustrated herein in the accompanying drawings can be come with a variety of configurations Arrangement and design.Therefore, the detailed description of the embodiment of the present utility model to providing in the accompanying drawings is not intended to limit below Claimed the scope of the utility model, but it is merely representative of selected embodiment of the present utility model.Based on the utility model Embodiment, the every other embodiment that those skilled in the art are obtained on the premise of creative work is not made, all Belong to the scope of the utility model protection.

In description of the present utility model, it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set Put ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, Or it is integrally connected；Can be mechanical connection or electrical connection；Can be joined directly together, intermediary can also be passed through It is indirectly connected, can is the connection of two element internals.For the ordinary skill in the art, can be managed with concrete condition Solve concrete meaning of the above-mentioned term in the utility model.

It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it further need not be defined and explained in subsequent accompanying drawing in individual accompanying drawing.

Below in conjunction with the accompanying drawings, some embodiments of the present utility model are elaborated.In the case where not conflicting, under Feature in the embodiment and embodiment stated can be mutually combined.

First embodiment

Referring to Fig. 1, the utility model provides a kind of low voltage cutoff circuit 100, the low voltage cutoff circuit 100 includes electricity Source T1, low power consumption voltage detection chip U1 and switch module, power supply T1 negative pole electrically connect with public terminal GND, power supply T1's Positive pole electrically connects with low power consumption voltage detection chip U1 input, low power consumption voltage detection chip U1 output end and switches set Part electrically connects.

It should be noted that in the present embodiment, because the low voltage cutoff circuit 100 is applied in intelligent gas meter system System, so power supply T1 uses lithium Asia battery.Because lithium Asia battery is both solvent and positive active material, so lithium Asia battery has There is the advantages of bigger than energy, its reachable 420Wh/Kg more general than energy, low rate is up to 650Wh/Kg when discharging.Also, lithium The voltage of sub- battery is very high, battery open circuit voltage 3.65V, and voltage is positively retained at 3.3V, 90% appearance when being discharged with 1mA/cm2 Voltage is kept constant in the range of amount.Lithium Asia battery also have high temperature performance it is also fine, typically can in -40~50 DEG C normal work Make, or even can be worked in -50~150 DEG C, the advantages that capacity at -40 DEG C is about the 50% of normal temperature capacity.Of course, at it In its some embodiments, other power supply T1 can also be used, the present embodiment does any restriction not to this.

It should also be noted that, because low power consumption voltage detection chip U1 can also consume a power supply T1 electricity at work Can, so, in order to make low power consumption voltage detection chip U1 reach the effect of low-power consumption, in the present embodiment, low-power consumption electricity Detection chip U1 is pressed to use model XC61CN3002MR low power consumption voltage detection chip.The low power consumption voltage detection chip energy 0.8V-6V voltages are enough detected, so the lithium Asia battery that detection the present embodiment provides can be applied to；Also, The low power consumption voltage detection chip of U1XC61CN3002MR models operating current when power supply T1 inputs are 1.5V is only 0.7uA, Static working current under 3.3V operating voltages is only 1uA, so the low power consumption voltage detection of U1XC61CN3002MR models The electricity of chip operation consumption is relatively low, can reach the effect of low-power consumption.Moreover, the low work(of U1XC61CN3002MR models Consuming voltage checking chip also has the advantages of accuracy of detection is high.Certain, in some other embodiments, low power consumption voltage inspection The chip of other models can also be used by surveying chip U1, and the present embodiment does any restriction not to this.

In the present embodiment, in order to prevent user by power supply T1 reversal connections, cause to detect circuit element i.e. low power consumption voltage Chip U1 damage, in the present embodiment, low voltage cutoff circuit 100 also include anti-reverse diode D1, anti-reverse diode D1 positive pole electrically connects with power supply T1 positive pole, anti-reverse diode D1 negative pole and low power consumption voltage detection chip U1 input End electrical connection.In the present embodiment, using the unilateral conduction of diode, the effect for preventing power supply T1 reversal connections is realized.Also, Power supply T1 is maintained at 3.3V when voltage can decline about 0.3V, i.e. lithium Asia battery discharge after anti-reverse diode D1, through anti-reverse After diode D1, voltage drops to 3V.

In the present embodiment, switch module includes the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, the first metal-oxide-semiconductor Q1 grid with Low power consumption voltage detection chip U1 output end electrical connection, the first metal-oxide-semiconductor Q1 source electrode electrically connect with public terminal GND, the first MOS Pipe Q1 drain electrode electrically connects with the second metal-oxide-semiconductor Q2 grid, the negative electricity of the second metal-oxide-semiconductor Q2 source electrode and anti-reverse diode D1 Connection, the second metal-oxide-semiconductor Q2 drain electrode is voltage output end, and it is electrically connected with intelligent gas meter.Also, in the present embodiment, One metal-oxide-semiconductor Q1 is N-type metal-oxide-semiconductor, and the second metal-oxide-semiconductor Q2 is p-type metal-oxide-semiconductor.

It should be noted that because N-type metal-oxide-semiconductor and p-type metal-oxide-semiconductor are voltage-controlled type electronic component, that is, pass through control Voltage can control N-type metal-oxide-semiconductor and the state of the conducting and disconnection of p-type metal-oxide-semiconductor.

In the present embodiment, low power consumption voltage detection chip U1 operation principle is：

Low power consumption voltage detection chip U1 can detect the voltage of anti-reverse diode D1 negative poles, because voltage passes through 3V can be reduced to after anti-reverse diode D1, so, 3V threshold voltage is pre-stored with low power consumption voltage detection chip U1, when When low power consumption voltage detection chip U1 detects that the voltage at anti-reverse diode D1 negative pole is more than or equal to 3V, low-power consumption electricity It is high level (LV_FLAG is high level) to press detection chip U1 output, now the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 all in Conducting state, power supply T1 are system normal power supply.With the continuous consumption of power supply T1 electricity, when power supply T1 electricity soon exhausts When, the voltage of power supply T1 outputs declines, and now, the voltage at anti-reverse diode D1 negative pole drops to below 3V, when low work( When consumption voltage checking chip U1 detects that the voltage at anti-reverse diode D1 negative pole is less than 3V, low power consumption voltage detection chip U1 output voltages are changed into low level (LV_FLAG is low level), and now the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 will disconnect, from And battery is set not to be system power supply again.

Because the phenomenon of spread of voltage only just occurs in power supply T1 when electricity soon exhausts, when the unstable electricity of use Press for intelligent gas meter system power supply when, may result in the loss of data of intelligent gas meter, intelligent gas meter information is occurred Safety problem, and the reliability and stability of intelligent gas meter is reduced.In the present embodiment, by setting low voltage cutoff electric Road 100, the appearance of the amphibolia of power supply T1 output voltages can be prevented, i.e., when power supply T1 electricity exhausts soon, stopped as intelligence Energy gas meter, flow meter system power supply, so as to improve the stability of system, reliability and the security of data.

It should be noted that in the present embodiment, in order to have the function that voltage stabilizing, the low voltage cutoff that the present embodiment provides is electric Road 100 also includes first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4.First resistor R1 one end with Anti-reverse diode D1 negative pole electrical connection, the first resistor R1 other end electrically connect with the first metal-oxide-semiconductor Q1 drain electrode.Second electricity Resistance R2 one end electrically connects with low power consumption voltage detection chip U1 output end, the second resistance R2 other end and anti-reverse two pole Pipe D1 negative pole electrical connection.3rd resistor R3 one end electrically connects with low power consumption voltage detection chip U1 output end, the 3rd electricity The resistance R3 other end electrically connects with the first metal-oxide-semiconductor Q1 grid.4th resistance R4 one end is used for the 3rd resistor R3 other end Electrical connection, the 4th resistance R4 other end electrically connect with public terminal GND.By setting first resistor R1, second resistance R2, the 3rd Resistance R3 and the 4th resistance R4, make the voltage of whole low voltage cutoff circuit 100 more stable.

It should also be noted that, in the present embodiment, external interference information is excluded in order to reach, so as to reach the low work(of protection Voltage checking chip U1 effect is consumed, low voltage cutoff circuit 100 also includes electric capacity C1, and electric capacity C1 one end and low power consumption voltage are examined Chip U1 input electrical connection is surveyed, the electric capacity C1 other end electrically connects with public terminal GND.By setting electric capacity C1, Neng Gouqi To the effect of filtering, i.e., the filter of external interference information is walked, so as to protect low power consumption voltage detection chip U1.

Second embodiment

Referring to Fig. 3, the utility model embodiment provides a kind of low-pressure alarming device 200, low-pressure alarming device 200 wraps Include control board 210 and low voltage cutoff circuit 100 as in the first embodiment, control board 210 and low voltage cutoff electricity The low power consumption voltage detection chip U1 electrical connections on road 100.The low voltage cutoff circuit 100 that the present embodiment is provided, its circuit element Want to listen with first embodiment with connected mode, to briefly describe, the present embodiment part does not refer to part, refers to above-mentioned implementation Corresponding contents in example.

Specifically, control board 210 is disposed with controller 211 and signal transmitting unit 212, controller 211 respectively with Low power consumption voltage detection chip U1, signal transmitting unit 212 electrically connect, and controller 211 and low power consumption voltage detection chip U1 Output end electrical connection, in the present embodiment, low power consumption voltage detection chip U1 is by high level or low level output to the first MOS , can also be by high level or low level output controller 211, when controller 211 receives electricity while pipe Q1 and the second metal-oxide-semiconductor Q2 Alarm signal can be generated after the low level that pressure detection is sent, and alarm signal is transmitted to signal transmitting unit 212.

Referring to Fig. 4, the signal transmitting unit 212 of low-pressure alarming device 200 is logical by network 300 with intelligent terminal 400 Letter connection, after signal transmitting unit 212 receives the alarm signal of the transmission of controller 211, alarm signal can be passed through network 300 transmission to intelligent terminal 400, intelligent terminals 400 can be the devices such as the mobile phone of user, computer, so as to prompt user electric Source T1 electricity will exhaust, and prompt user to change power supply T1.

In summary, the utility model provides a kind of low voltage cutoff circuit, and the low voltage cutoff circuit includes low-power consumption Voltage checking chip and switch module.On the one hand, when the electricity of power supply will exhaust, the voltage of power supply output reduces, and low work( Consumption voltage checking chip is able to detect that the voltage of power supply.When the discharge voltage of power supply is normal, low power consumption voltage detection chip High level can be exported, turns on switch module, so as to be system power supply；When electric quantity of power supply will exhaust, electric power output voltage Reduce, now voltage detection module output low level, disconnect switch module, so as to be system power supply.Because power supply is defeated When the amphibolia of the voltage gone out is only present in electric quantity of power supply and will exhausted, i.e., by setting low voltage cutoff circuit, it can prevent The appearance of the amphibolia of electric power output voltage, so as to improve the stability of system, reliability and Information Security.Second Aspect, the low power consumption voltage detection chip used due to the utility model for low-power consumption low power consumption voltage detection chip so that The power consumption of low power consumption voltage detection chip is smaller, so as to add the service life of power supply, reduces use cost.

, it is necessary to which explanation, term " first ", " second ", " the 3rd ", " the 4th " etc. are only in description of the present utility model Described for distinguishing, and it is not intended that instruction or hint relative importance.It the foregoing is only of the present utility model preferred real Example is applied, is not limited to the utility model, for those skilled in the art, the utility model can have various Change and change.All any modification, equivalent substitution and improvements within the spirit and principles of the utility model, done etc., all should Within the scope of protection of the utility model.

Claims (10)

1. a kind of low voltage cutoff circuit, it is characterised in that the low voltage cutoff circuit includes low power consumption voltage detection chip with opening Pass component, the input and a power electric connection of the low power consumption voltage detection chip, the low power consumption voltage detection chip Output end electrically connects with the switch module, and the low power consumption voltage detection chip is used for the voltage for detecting the power supply, judges The voltage of power supply threshold voltage whether pre-stored less than the low power consumption voltage detection chip, if it is, control institute State switch module disconnection.

2. low voltage cutoff circuit as claimed in claim 1, it is characterised in that the model of the low power consumption voltage detection chip U1XC61CN3002MR low power consumption voltage detection chip.

3. low voltage cutoff circuit as claimed in claim 1, it is characterised in that the low voltage cutoff circuit also includes anti-reverse two Pole pipe, the positive pole of the anti-reverse diode electrically connect with the positive pole of the power supply, the negative pole difference of the anti-reverse diode Electrically connected with the input of the switch module, the low power consumption voltage detection chip.

4. low voltage cutoff circuit as claimed in claim 3, it is characterised in that the switch module includes the first metal-oxide-semiconductor and the Two metal-oxide-semiconductors, the grid of first metal-oxide-semiconductor electrically connect with the output end of the low power consumption voltage detection chip, the first MOS The source electrode of pipe electrically connects with common port, and the drain electrode of first metal-oxide-semiconductor electrically connects with the grid of second metal-oxide-semiconductor, and described The source electrode of two metal-oxide-semiconductors electrically connects with the negative pole of the anti-reverse diode.

5. low voltage cutoff circuit as claimed in claim 4, it is characterised in that the low voltage cutoff circuit also includes the first electricity Resistance, one end of the first resistor electrically connect with the negative pole of the anti-reverse diode, the other end of the first resistor and institute State the drain electrode electrical connection of the first metal-oxide-semiconductor.

6. low voltage cutoff circuit as claimed in claim 4, it is characterised in that the low voltage cutoff circuit also includes the 3rd electricity Resistance, one end of the 3rd resistor electrically connects with the output end of the low power consumption voltage detection chip, the 3rd resistor it is another One end electrically connects with the grid of first metal-oxide-semiconductor.

7. low voltage cutoff circuit as claimed in claim 6, it is characterised in that the low voltage cutoff circuit also includes the 4th electricity Resistance, one end of the 4th resistance are used for the other end electrical connection of the 3rd resistor, the other end and the public affairs of the 4th resistance End electrical connection altogether.

8. low voltage cutoff circuit as claimed in claim 3, it is characterised in that the low voltage cutoff circuit also includes the second electricity Resistance, one end of the second resistance electrically connects with the output end of the low power consumption voltage detection chip, the second resistance it is another One end electrically connects with the negative pole of the anti-reverse diode.

9. low voltage cutoff circuit as claimed in claim 1, it is characterised in that the low voltage cutoff circuit also includes electric capacity, institute The one end for stating electric capacity electrically connects with the input of the low power consumption voltage detection chip, the other end and the common port electricity of the electric capacity Connection.

10. a kind of low-pressure alarming device, it is characterised in that the low-pressure alarming device includes control board and such as claim Low voltage cutoff circuit described in 1 to 9 any one, the control board is disposed with controller and signal transmitting unit, described Controller electrically connects with the low power consumption voltage detection chip, the signal transmitting unit respectively, and the controller is used to connect Alarm signal is generated after receiving the low level that the low power consumption voltage detection chip is sent, and the alarm signal is transmitted to institute Signal transmitting unit is stated, the signal transmitting unit is used to send the alarm signal received to an intelligent terminal.