CN206805738U - Residual current type detector for electric fire protection - Google Patents
Residual current type detector for electric fire protection Download PDFInfo
- Publication number
- CN206805738U CN206805738U CN201720686963.0U CN201720686963U CN206805738U CN 206805738 U CN206805738 U CN 206805738U CN 201720686963 U CN201720686963 U CN 201720686963U CN 206805738 U CN206805738 U CN 206805738U
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- China
- Prior art keywords
- circuit
- operational amplifier
- power supply
- signal
- residual current
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Abstract
The utility model provides a kind of residual current type detector for electric fire protection, and the output end in the signal sampling loop is connected to the reverse input end of the operational amplifier；After the output end of the reference power supply passes sequentially through the reference power supply bleeder circuit and the voltage follower, the positive input of the operational amplifier is connected to；The output end of the operational amplifier is connected to the input of the single-chip microcomputer by the signal filter circuit；The control terminal of the single-chip microcomputer is connected with the control terminal of the switching tube in the signal sampling loop.Advantage is：Signal is gathered using integrated operational amplifier circuit, measurement is accurate, and precision is high, while has the arbitration functions with external impressed current transformer connection status, i.e.,：It can determine whether out whether current transformer occurs short circuit or off state, expand the feature of monitoring detector, can safer reliable progress electrical fire monitoring.
Description
Technical field
It the utility model is related to a kind of monitoring detector, and in particular to a kind of residual-current electrical fire monitoring detection
Device.
Background technology
During with residual current in electric line be present, electrical fire easily occurs, also, fire caused by such a situation is in whole
Occupy very high ratio in electrical fire.Residual current type detector for electric fire protection is by built-in circuit to Current Mutual Inductance
What device collected is monitored with electric line residual current situation, and when Live wires road residual current is exceeded and alarm, from
And ensure the safety and reliability of power supply.
However, existing residual current type detector for electric fire protection, function is single, can not especially monitor itself and electricity
The connection status of current transformer, such as, if short circuit or off state occurs, makes residual current type detector for electric fire protection
With certain limitation.
Utility model content
The defects of existing for prior art, the utility model provide a kind of residual-current electrical fire monitoring detection
Device, can effectively it solve the above problems.
The technical solution adopted in the utility model is as follows：
The utility model provides a kind of residual current type detector for electric fire protection, including single-chip microcomputer, communicating circuit, confession
Power supply and signal sample circuit；The single-chip microcomputer respectively with the communicating circuit, the power supply and the signal sampling
Circuit connects；
Wherein, the signal sample circuit includes：Signal sampling loop, signal filter circuit, operational amplifier, benchmark electricity
Source, reference power supply bleeder circuit and voltage follower；
The output end in the signal sampling loop is connected to the reverse input end of the operational amplifier；The reference power supply
Output end pass sequentially through the reference power supply bleeder circuit and the voltage follower after, be connected to the operational amplifier
Positive input；The output end of the operational amplifier is connected to the input of the single-chip microcomputer by the signal filter circuit
End；The control terminal of the single-chip microcomputer is connected with the control terminal of the switching tube in the signal sampling loop；
Wherein, the signal sampling loop includes：Divider resistance, switching tube and foreign current transformer；The benchmark electricity
After the output end in source is by the divider resistance, one end of the switching tube is connected to, the other end of the switching tube draws two
Individual lead, a lead are connected to the reverse input end of the operational amplifier；Another lead is mutual by the foreign current
It is grounded after sensor.
Preferably, the single-chip microcomputer is MCU；The communicating circuit is CANBUS communicating circuits.
Preferably, the signal filter circuit is RC filter circuits.
Preferably, the operational amplifier is MCP6002 operational amplifiers.
Preferably, the setting quantity of the signal sample circuit is 4.
Residual current type detector for electric fire protection provided by the utility model has advantages below：
Signal is gathered using integrated operational amplifier circuit, measurement is accurate, and precision is high, while has and external impressed current mutual inductance
The arbitration functions of device connection status, i.e.,：It can determine whether out whether current transformer occurs short circuit or off state, expand monitoring and visit
The feature of device is surveyed, can safer reliable progress electrical fire monitoring.
Brief description of the drawings
Fig. 1 is the circuit theory total figure of residual current type detector for electric fire protection provided by the utility model；
Fig. 2 is the circuit theory diagrams of signal sample circuit provided by the utility model；
Fig. 3 is the circuit diagram of part 1 in signal sample circuit provided by the utility model；
Fig. 4 is the circuit diagram of part 2 in signal sample circuit provided by the utility model；
Fig. 5 is the circuit diagram of third portion in signal sample circuit provided by the utility model；
Fig. 6 is the circuit diagram of the part 1 of CANBUS communicating circuits provided by the utility model；
Fig. 7 is the circuit diagram of the part 2 of CANBUS communicating circuits provided by the utility model；
Fig. 8 is the circuit theory diagrams of power supply provided by the utility model；
Fig. 9 is the circuit diagram of the part 1 of power supply provided by the utility model；
Figure 10 is the circuit diagram of the part 2 of power supply provided by the utility model；
Figure 11 is the circuit diagram of the third portion of power supply provided by the utility model；
Figure 12 is the circuit diagram of the 4th part of power supply provided by the utility model；
Figure 13 is the circuit diagram of key part in display button circuit provided by the utility model；
Figure 14 is the circuit diagram of indicator lamp part in display button circuit provided by the utility model；
Figure 15 is the circuit diagram of display screen part in display button circuit provided by the utility model.
Embodiment
In order that technical problem, technical scheme and beneficial effect that the utility model solves are more clearly understood, below
With reference to drawings and Examples, the utility model is further elaborated.It should be appreciated that specific implementation described herein
Example only to explain the utility model, is not used to limit the utility model.
The utility model provides a kind of residual current type detector for electric fire protection, including single-chip microcomputer, communicating circuit, confession
Power supply and signal sample circuit；The single-chip microcomputer respectively with the communicating circuit, the power supply and the signal sampling
Circuit connects.Each several part is discussed in detail below：
(1) single-chip microcomputer
The utility model is using the chip MC9S08DZ60AWLH-68PIN (U8) that Freescale company produces as monitoring
The control chip of detector, it is small power consumption the characteristics of the chip, arithmetic speed is fast, and chip has 24 ADC input pins, each to return
Road individually gathered data calculation process, monitoring loop can be independent of each other.
(2) signal sample circuit
With reference to figure 2, signal sample circuit includes：Signal sampling loop, signal filter circuit, operational amplifier, benchmark electricity
Source, reference power supply bleeder circuit and voltage follower；
The output end in the signal sampling loop is connected to the reverse input end of the operational amplifier；The reference power supply
Output end pass sequentially through the reference power supply bleeder circuit and the voltage follower after, be connected to the operational amplifier
Positive input；The output end of the operational amplifier is connected to the input of the single-chip microcomputer by the signal filter circuit
End；The control terminal of the single-chip microcomputer is connected with the control terminal of the switching tube in the signal sampling loop；
Wherein, the signal sampling loop includes：Divider resistance, switching tube and foreign current transformer；The benchmark electricity
After the output end in source is by the divider resistance, one end of the switching tube is connected to, the other end of the switching tube draws two
Individual lead, a lead are connected to the reverse input end of the operational amplifier；Another lead is mutual by the foreign current
It is grounded after sensor.
The Leakage Current that residual current type detector for electric fire protection passes through zero phase-sequence transformer collection electrical circuit.Prison
Control detector has four loops, and working method is described in detail by taking first loop as an example.
Its realization principle is：Input signal is AC sine wave, amplitude 0.7V, signal input terminal one end ground connection, one end
Connect operational amplifier MCP6002 reverse input ends；Operational amplifier U15A, resistance R75, R80, R79 composition operational amplification circuit.
Reference voltage partial pressure is 0.365V by R123, R124, and U10B is voltage follower, load capacity is improved, by DC reference voltage
The positive input of operational amplifier is accessed, the AC signal exported after computing raises 1.67V, because operational amplifier input
It is AC signal, with the presence of high frequency spurs in signal, the size of actual signal numerical value is influenceed after amplification, so in feedback resistance
R75 one high frequency capacitance C60 of upper parallel connection, provide a high-frequency ac negative feedback channel by electric capacity and increase to reduce the high frequency of amplifier
Benefit, so as to avoid the possibility that the higher-order of oscillation occurs.Resistance R64, electric capacity C22 form RC filter circuits, are accessed after signal filtering
MCU single-chip microcomputers.During circuit normal work, the DC component of operational amplifier output terminal is DC1.67V.
When input circuit (IN, GND) and residual current formula transformer disconnect, the reverse input end of operational amplifier does not have
Signal inputs, and operational amplifier configuration is equivalent to forward operation amplifier, because having DC reference voltage input, operational amplifier
Output voltage is DC0.5V, i.e.,：When output valve is less than 0.6V, open-circuit condition is judged.
When input circuit (IN, GND) and the judgment mode of residual current formula transformer short circuit are：Single-chip microprocessor MCU passes through control
The opening metal-oxide-semiconductor Q (20ms) of pin CH loop cycles processed, DC4V bias voltage is superimposed to signal input circuit, within this cycle,
When input circuit (IN, GND) is normally connected with residual current formula transformer, the output signal DC component of operational amplifier is more than
1.8V；When input circuit (IN, GND) is connected with the short circuit of residual current formula transformer, the output signal direct current point of operational amplifier
Amount is less than 1.8V.I.e.：When input circuit (IN, GND) has DC4V bias voltage, the output signal DC component of operational amplifier
During less than 1.8V, it is judged as short-circuit condition.
(3) communicating circuit
Communicating circuit is CANBUS communicating circuits.With reference to figure 6- Fig. 7, using CAN transceiving chips TJA1051 as with it is electric
The communication interface of fire hazard monitoring equipment, with two 6N137 (U1, U2) and DC/DC insulating power supply modules PW1 composition photoelectricity every
From circuit, ensure communication robust work, avoid the potential difference between live disparate modules from burning circuit.In communication output end H, L
There is electrostatic protection chip PESD1CAN (U3), do electrostatic protection.
(4) power supply
Power supply includes：External AC 220V power input interfaces, EMC electromagnetic compatible protectives circuit, AC/DC power supply moulds
Block, capacitor filter, high-frequency impulse suppression circuit, DC/DC reduction voltage circuits and reference power circuit；External AC 220V power supplys are defeated
After incoming interface passes sequentially through EMC electromagnetic compatible protectives circuit, AC/DC power modules and capacitor filter, high frequency arteries and veins is connected to
Rush the input of suppression circuit；First output end of high-frequency impulse suppression circuit is connected to reference power circuit；High-frequency impulse presses down
Second output end of circuit processed is connected to DC/DC reduction voltage circuits.
With reference to figure 8- Figure 12, monitoring detector is using way to take power on the spot, power supply AC220V, 50Hz.Using integrated electricity
Source module AD-DC-5V powers, and advantage is small volume, output voltage stabilization, module design, is maintained easily.Fuse F1, EMI magnetic
Ring, piezo-resistance RV1, thermistor NTC1, X electric capacity C12, common mode inductance LH1, Y capacitance C5, C6 are AC220V power supplys EMC electricity
The compatible protection of magnetic.C13, C14 are output filter capacitors.Transient Suppression Diode D11-12, suppress the high frequency spikes arteries and veins on power supply
Punching.PW2, C39, C40, CD1, CD2 are DC-DC reduction voltage circuits, and power supply is provided to liquid crystal display.With three-terminal voltage-stabilizing chip VD1
(TL431), triode Q1 (S8050), resistance R16, R17, R18, electric capacity C7 design a constant pressure source, output constant current voltage
DC4V, the reference voltage as sampled signal.
(5) display button circuit
Single-chip microcomputer is also associated with display button circuit.With reference to figure 13- Figure 15, residual current type detector for electric fire protection
There are four buttons, five indicator lamps, an OLED128*64 LCDs.Can be with the Leakage Current of real-time display monitoring loop
Numerical value, running status prompting, sets the work such as address, alarm threshold value.Convenient management.
Residual current type detector for electric fire protection provided by the utility model has advantages below：
(1) using integrated operational amplifier circuit collection signal, measurement is accurate, and precision is high, while has and external impressed current
The arbitration functions of transformer connection status, i.e.,：It can determine whether out whether current transformer occurs short circuit or off state, expand prison
The feature of detector is controlled, can safer reliable progress electrical fire monitoring.
(2) EMC protection circuitry is added in power supply, strong antijamming capability in detector actual motion is stable.
(3) also there is the advantages of simple in construction, small volume, space-consuming is few, easy for installation.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching should also regard the scope of protection of the utility model.
Claims (5)
1. a kind of residual current type detector for electric fire protection, it is characterised in that including single-chip microcomputer, communicating circuit, power supply electricity
Source and signal sample circuit；The single-chip microcomputer respectively with the communicating circuit, the power supply and the signal sample circuit
Connection；
Wherein, the signal sample circuit includes：Signal sampling loop, signal filter circuit, operational amplifier, reference power supply,
Reference power supply bleeder circuit and voltage follower；
The output end in the signal sampling loop is connected to the reverse input end of the operational amplifier；The reference power supply it is defeated
Go out after end passes sequentially through the reference power supply bleeder circuit and the voltage follower, be connected to the forward direction of the operational amplifier
Input；The output end of the operational amplifier is connected to the input of the single-chip microcomputer by the signal filter circuit；Institute
The control terminal for stating single-chip microcomputer is connected with the control terminal of the switching tube in the signal sampling loop；
Wherein, the signal sampling loop includes：Divider resistance, switching tube and foreign current transformer；The reference power supply
After output end is by the divider resistance, one end of the switching tube is connected to, the other end of the switching tube is drawn two and drawn
Line, a lead are connected to the reverse input end of the operational amplifier；Another lead passes through the foreign current transformer
After be grounded.
2. residual current type detector for electric fire protection according to claim 1, it is characterised in that the single-chip microcomputer is
MCU；The communicating circuit is CANBUS communicating circuits.
3. residual current type detector for electric fire protection according to claim 1, it is characterised in that the signal filtering
Circuit is RC filter circuits.
4. residual current type detector for electric fire protection according to claim 1, it is characterised in that the operation amplifier
Device is MCP6002 operational amplifiers.
5. residual current type detector for electric fire protection according to claim 1, it is characterised in that the signal sampling
The setting quantity of circuit is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720686963.0U CN206805738U (en) | 2017-06-14 | 2017-06-14 | Residual current type detector for electric fire protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720686963.0U CN206805738U (en) | 2017-06-14 | 2017-06-14 | Residual current type detector for electric fire protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206805738U true CN206805738U (en) | 2017-12-26 |
Family
ID=60746200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720686963.0U Expired - Fee Related CN206805738U (en) | 2017-06-14 | 2017-06-14 | Residual current type detector for electric fire protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206805738U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051634A (en) * | 2018-01-18 | 2018-05-18 | 智慧式控股有限公司 | A kind of distribution residual current measuring system |
| CN109188063A (en) * | 2018-09-26 | 2019-01-11 | 北京明日电力电子有限公司 | A kind of sensor self-adaptation type composite electric fire hazard monitoring detector |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
| CN109932558A (en) * | 2019-04-15 | 2019-06-25 | 苏州未来电器股份有限公司 | Magnetic based on the power supply of single positive supply modulates alternating current-direct current residual current detection system |
| CN110907863A (en) * | 2019-12-10 | 2020-03-24 | 湖南优利泰克自动化系统有限公司 | Analog input channel wiring state detection method and system |
| CN111095372A (en) * | 2018-01-22 | 2020-05-01 | 报知机股份有限公司 | Fire alarm device |
-
2017
- 2017-06-14 CN CN201720686963.0U patent/CN206805738U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051634A (en) * | 2018-01-18 | 2018-05-18 | 智慧式控股有限公司 | A kind of distribution residual current measuring system |
| CN111095372A (en) * | 2018-01-22 | 2020-05-01 | 报知机股份有限公司 | Fire alarm device |
| CN111095372B (en) * | 2018-01-22 | 2021-11-02 | 报知机股份有限公司 | Fire alarm device |
| CN109188063A (en) * | 2018-09-26 | 2019-01-11 | 北京明日电力电子有限公司 | A kind of sensor self-adaptation type composite electric fire hazard monitoring detector |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
| CN109932558A (en) * | 2019-04-15 | 2019-06-25 | 苏州未来电器股份有限公司 | Magnetic based on the power supply of single positive supply modulates alternating current-direct current residual current detection system |
| CN110907863A (en) * | 2019-12-10 | 2020-03-24 | 湖南优利泰克自动化系统有限公司 | Analog input channel wiring state detection method and system |
| CN110907863B (en) * | 2019-12-10 | 2022-01-07 | 湖南优利泰克自动化系统有限公司 | Analog input channel wiring state detection method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171226 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |