CN109406867B - Residual current transformer signal acquisition circuit - Google Patents
Residual current transformer signal acquisition circuit Download PDFInfo
- Publication number
- CN109406867B CN109406867B CN201811478550.9A CN201811478550A CN109406867B CN 109406867 B CN109406867 B CN 109406867B CN 201811478550 A CN201811478550 A CN 201811478550A CN 109406867 B CN109406867 B CN 109406867B
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- resistor
- electric capacity
- capacitor
- triode
- residual current
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- 239000003990 capacitor Substances 0.000 claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000005672 electromagnetic field Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
- Alarm Systems (AREA)
Abstract
The invention relates to the technical field of fire monitoring, in particular to a residual current transformer signal acquisition circuit which can effectively improve the anti-interference capability of a circuit, and comprises a residual current detection module, an alarm module and a power module which are connected with a CPU module, wherein the residual current detection module comprises a residual current transformer, one end of the residual current transformer is connected with a 1 pin of a common mode inductor L101, the other end of the residual current transformer is connected with a 2 pin of the common mode inductor L101, a 3 pin of the common mode inductor L101 is connected with one end of a resistor R5, one end of a capacitor C301, one end of a capacitor C201, the anode of a diode D5, one end of the resistor R101, the 4 pin of the common mode inductor, the other end of the resistor R5, the other end of the capacitor C301, the other end of the capacitor C201, the cathode of the diode D4 and the anode of the diode D5 are all grounded, one end of the resistor R201, one end of the other end of the resistor U3 of the operational amplifier, and the 8 pins of the operational amplifier U3 are connected with VCC, one end of the 3 pin is connected with one end of the resistor R102, and the other end of the 4 pin of the operational amplifier U3 is grounded.
Description
Technical Field
The invention relates to the technical field of fire monitoring, in particular to a residual current transformer signal acquisition circuit.
Background
The residual current type fire detector is required to be installed in general industrial and civil buildings, and has the function of analyzing fire accidents caused by circuit reasons in important places in the buildings, preparing for detecting the leakage change in a circuit line in real time, and immediately sending an alarm signal when the current in the detected circuit line is abnormal. At present, the existing product is easy to alarm by mistake when used in an environment with strong electromagnetic field, especially under a high-frequency signal of 100-200MHz, and is mainly the imperfect design of the signal acquisition circuit of the residual current transformer and weak in anti-interference capability through experimental verification.
Disclosure of Invention
The invention provides a residual current transformer signal acquisition circuit which can effectively improve the anti-interference capability of the circuit.
The technical scheme is as follows: the utility model provides a residual current transformer signal acquisition circuit, its includes residual current detection module, alarm module, the power module who is connected with the CPU module, its characterized in that, residual current detection module includes residual current transformer, the 1 foot of residual current transformer one end connection common mode inductance L101, the other end is connected common mode inductance L101's 2 feet, the 3 foot of common mode inductance L101 connects resistance R5 one end, electric capacity C301 one end, electric capacity C201 one end, diode D4 positive pole, diode D5 negative pole, electric capacity R101 one end, the 4 feet of common mode inductance, the other end of electric capacity R5, the electric capacity C301 other end, electric capacity C201 other end, diode D4 negative pole, the positive pole of diode D5 all connects ground, the electric capacity R101 other end connection resistance R201 one end, operational amplifier U3's 2 feet, operational amplifier U3's 8 feet connect VCC, 3 feet connect resistance R102 one end, the other end of resistance R102 and operational amplifier U3's 4 feet are connected ground, the foot connection, the pin 1 foot of operational amplifier connects resistance R10, the other end of electric capacity C201, the other end of electric capacity C10, the one end of electric capacity C7, the other end connection of electric capacity C10, the one end of electric capacity C10, the end connection of electric capacity C10, the C7, the one end of electric capacity C10, the end connection of electric capacity C10, the one end connection of electric capacity C3, the end connection of the electric capacity C10, the one end connection, the end connection.
The CPU module is further characterized by comprising a PIC16F684 chip U1, and the other end of the resistor R104 is connected with the 7 pin of the PIC16F684 chip U1;
the power supply module comprises a 24V power supply and a voltage stabilizing chip U2, wherein a pin 1 of the voltage stabilizing chip U2 is connected with one end of a capacitor C101, one end of a capacitor C1 and the 24V power supply, a pin 3 of the voltage stabilizing chip U2 is an output VCC end and is connected with one end of the capacitor C2, one end of the capacitor C102 and one end of the capacitor C103, and the other end of the capacitor C101, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C102, the other end of the capacitor C103, and the pins 2 and 4 of the voltage stabilizing chip U2 are grounded;
the alarm module comprises an indicator lamp circuit and a sounding circuit, the sounding circuit comprises a loudspeaker S1, one end of the loudspeaker S1 is connected with one end of a resistor R18 and one end of a resistor R20, the other end of the resistor R18 is connected with one end of a resistor R20, the other end of the loudspeaker S1 is connected with a collector of a triode Q4, an emitter electrode of the triode Q4 is grounded, one end of a base electrode is connected with one end of a resistor R27, the other end of the resistor R27 is connected with 3 pins of a PIC16F684 chip U1, the indicator lamp circuit comprises a light emitting diode LED1, a light emitting diode LED2 and a light emitting diode LED3, the positive electrode of the light emitting diode LED1, the positive electrode of the light emitting diode LED2 and the positive electrode of the light emitting diode LED3 are both connected with an external DC power supply, the negative electrode of the light emitting diode LED1 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with a collector of the triode Q1, the emitter electrode of the triode Q1 is grounded, the base electrode of the triode Q1 is connected with 11 pins of a PIC16F684 chip U1 through a resistor R202, the base electrode of the triode Q1 is connected with the base electrode of the triode Q2, the base electrode of the triode Q1 is connected with the base electrode of the resistor R3, and the base electrode of the triode Q1 is connected with the base electrode of the triode Q2 through the resistor R16F 3, and the base electrode of the triode Q1 is connected with the base electrode of the resistor Q2.
After the invention is adopted, the common-mode inductance L101 is added in the residual current detection module, and a plurality of anti-interference capacitors are reasonably distributed, so that residual current signals acquired by the residual current transformer are not influenced by external interference sources, and the anti-interference capability of the circuit is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a system of the present invention;
FIG. 2 is a schematic diagram of a residual current detection module circuit;
FIG. 3 is a schematic circuit diagram of a CPU module;
FIG. 4 is a schematic diagram of an alarm module circuit;
fig. 5 is a schematic diagram of a power module circuit.
Detailed Description
Referring to fig. 1 to 5, a residual current transformer signal acquisition circuit includes a residual current detection module, an alarm module, and a power module connected with a CPU module, where the CPU module includes a PIC16F684 chip U1, the residual current detection module includes a residual current transformer, one end of the residual current transformer is connected to a 1 pin of a common mode inductor L101, the other end of the residual current transformer is connected to a 2 pin of the common mode inductor L101, a 3 pin of the common mode inductor L101 is connected to one end of a resistor R5, one end of a capacitor C301, one end of a capacitor C201, an anode of a diode D4, one end of a resistor R101, a 4 pin of the common mode inductor, the other end of the resistor R5, the other end of the capacitor C301, the other end of the capacitor C201, the anode of the diode D4, and the anode of the diode D5 are all grounded, one end of the resistor R101 is connected to one end of the resistor R201, and the 2 pin of an operational amplifier U3, the 8-pin connection VCC of operational amplifier U3, 3 pin connection resistance R102 one end, the resistance R102 other end is connected with the 4-pin of operational amplifier U3 back ground, the 1-pin connection resistance R10 one end of operational amplifier, the resistance R201 other end, electric capacity C7 one end is connected to the resistance R10 other end, the 5-pin of operational amplifier U3, the 6-pin connection resistance R103 one end of operational amplifier U3, resistance R11 one end, the ground connection is connected to the resistance R103 other end, the 7-pin of operational amplifier U3, resistance R104 one end, electric capacity C6 one end is connected to the resistance R104 other end, electric capacity C105 one end, PIC16F684 chip U1's 7-pin, be provided with electric capacity C104 and electric capacity C202 by operational amplifier U3, electric capacity C104 and electric capacity C202 one end all ground connection, the VCC is all connected to the other end.
The power module comprises a 24V power supply and a voltage stabilizing chip U2, wherein a 1 pin of the voltage stabilizing chip U2 is connected with one end of a capacitor C101, one end of a capacitor C1 and the 24V power supply, a 3 pin of the voltage stabilizing chip U2 is an output VCC end and is connected with one end of the capacitor C2, one end of the capacitor C102 and one end of the capacitor C103, and the other end of the capacitor C101, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C102, the other end of the capacitor C103, and the 2 pin and the 4 pin of the voltage stabilizing chip U2 are grounded.
The alarm module comprises an indicator lamp circuit and a sounding circuit, the sounding circuit comprises a loudspeaker S1, one end of the loudspeaker S1 is connected with one end of a resistor R18, one end of a resistor R20, the other end of the resistor R18 and the other end of the resistor R20 are both connected with VCC, the other end of the loudspeaker S1 is connected with a collector of a triode Q4, the emitter of the triode Q4 is grounded, one end of a base electrode is connected with one end of a resistor R27, the other end of the resistor R27 is connected with a 3 pin of a PIC16F684 chip U1, the indicator lamp circuit comprises a light emitting diode LED1, a light emitting diode LED2 and a light emitting diode LED3, the positive electrode of the light emitting diode LED1 and the positive electrode of the light emitting diode LED2 are both connected with an external DC power supply, the light emitting diode LED1 is a green LED lamp, the triode Q1 is used as a normal operation system lamp, the light emitting diode LED2 is a red LED lamp used as a system alarm lamp, the light emitting diode LED3 is a yellow LED lamp used as a fault lamp, the negative electrode of the triode Q1 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with the collector of the triode Q1, the triode Q1 is grounded, the triode Q1 is connected with the other end of the resistor R27, the triode Q1 is connected with the base electrode of the triode Q1 through the resistor R684, the base electrode of the triode Q1 is connected with the base electrode of the triode Q1, the triode Q1 is connected with the base of the resistor R6816, the triode Q1 is connected with the base of the triode Q1 through the resistor R16, the resistor R3, the base of the triode Q2 is connected with the base of the triode Q2R 3 and the triode Q1 through the base of the resistor R3, the triode Q2R 3 is connected with the base of the triode Q2 through the base of the triode Q2R 3.
The beneficial effects of the invention are illustrated by specific experiments:
testing the existing product
From the test results, the mutual inductor of the residual current type fire monitoring detector is influenced by the radio frequency electromagnetic field radiation signal, and the alarm lamp is lightened and sends an alarm signal to the controller.
In general, there are 3 common methods for suppressing interference signals:
cutting off the propagation path;
reducing the outward emission of the interference source;
the anti-interference capability of the test product is improved.
In practical application, the residual current type fire monitoring detector is not displayed and is not applicable.
Then, the product of the invention is adopted for testing, the common-mode inductance is connected in series at the front end of the signal of the sampling transformer, meanwhile, a filter capacitor (C201:20pF) is added, a filter capacitor (C105:0.1 Uf) is added at the output end of the signal processing circuit, and a filter capacitor (C2021:20pF) is added at VCC.
The test was repeated to obtain the following results
The experimental structure can obviously show that the product of the invention can effectively resist interference.
The invention adopts accurate analog-digital A/D conversion in the CPU to monitor the residual current transformer in real time and judge the data, displays the condition on the circuit, and simultaneously transmits the condition on the circuit to the upper computer through two buses, thereby changing the invisible electricity consumption condition into visible digital monitoring and providing a comprehensive solution for effectively preventing electric fire.
Claims (4)
1. The utility model provides a residual current transformer signal acquisition circuit, its includes residual current detection module, alarm module, the power module who is connected with the CPU module, its characterized in that, residual current detection module includes residual current transformer, the 1 foot of residual current transformer one end connection common mode inductance L101, the other end is connected common mode inductance L101's 2 feet, the 3 foot of common mode inductance L101 connects resistance R5 one end, electric capacity C301 one end, electric capacity C201 one end, diode D4 positive pole, diode D5 negative pole, electric capacity R101 one end, the 4 feet of common mode inductance, the other end of electric capacity R5, the electric capacity C301 other end, electric capacity C201 other end, diode D4 negative pole, the positive pole of diode D5 all connects ground, the electric capacity R101 other end connection resistance R201 one end, operational amplifier U3's 2 feet, operational amplifier U3's 8 feet connect VCC, 3 feet connect resistance R102 one end, the other end of resistance R102 and operational amplifier U3's 4 feet are connected ground, the foot connection, the pin 1 foot of operational amplifier connects resistance R10, the other end of electric capacity C201, the other end of electric capacity C10, the one end of electric capacity C7, the other end connection of electric capacity C10, the one end of electric capacity C10, the end connection of electric capacity C10, the C7, the one end of electric capacity C10, the end connection of electric capacity C10, the one end connection of electric capacity C3, the end connection of the electric capacity C10, the one end connection, the end connection.
2. The residual current transformer signal collection circuit according to claim 1, wherein the CPU module comprises a PIC16F684 chip U1, and the other end of the resistor R104 is connected to the 7 pins of the PIC16F684 chip U1.
3. The residual current transformer signal collection circuit according to claim 2, wherein the power module comprises a 24V power supply and a voltage stabilizing chip U2, pin 1 of the voltage stabilizing chip U2 is connected to one end of a capacitor C101, one end of a capacitor C1 and the 24V power supply, pin 3 of the voltage stabilizing chip U2 is an output VCC end and is connected to one end of the capacitor C2, one end of the capacitor C102 and one end of the capacitor C103, and the other end of the capacitor C101, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C102, the other end of the capacitor C103, and pins 2 and 4 of the voltage stabilizing chip U2 are all grounded.
4. The residual current transformer signal collecting circuit according to claim 2, wherein the alarm module comprises an indicator light circuit and a sound generating circuit, the sound generating circuit comprises a speaker S1, one end of the speaker S1 is connected with one end of a resistor R18 and one end of a resistor R20, the other end of the resistor R18 and the other end of the resistor R20 are both connected with VCC, the other end of the speaker S1 is connected with a collector of a triode Q4, an emitter of the triode Q4 is grounded, a base is connected with one end of a resistor R27, the other end of the resistor R27 is connected with a pin 3 of the PIC16F684 chip U1, the indicator light circuit comprises a light emitting diode LED1, a light emitting diode LED2 and a light emitting diode LED3, the positive electrode of the light emitting diode LED1, the positive electrode of the light emitting diode LED2 and the positive electrode of the light emitting diode LED3 are all connected with an external DC power supply, the LED is characterized in that the negative electrode of the LED1 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with the collector of the triode Q1, the emitter of the triode Q1 is grounded, the base electrode of the triode Q1 is connected with the 11 pin of the PIC16F684 chip U1 through a resistor R202, the negative electrode of the LED2 is connected with one end of a resistor R106, the other end of the resistor R106 is connected with the collector of the triode Q2, the emitter of the triode Q2 is grounded, the base electrode of the triode Q2 is connected with the 13 pin of the PIC16F684 chip U1 through a resistor R203, the negative electrode of the LED3 is connected with one end of a resistor R107, the other end of the resistor R107 is connected with the collector of the triode Q3, the emitter of the triode Q3 is grounded, and the base electrode of the triode Q3 is connected with the 5 pin of the PIC16F684 chip U1 through a resistor R204.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811478550.9A CN109406867B (en) | 2018-12-05 | 2018-12-05 | Residual current transformer signal acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811478550.9A CN109406867B (en) | 2018-12-05 | 2018-12-05 | Residual current transformer signal acquisition circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109406867A CN109406867A (en) | 2019-03-01 |
| CN109406867B true CN109406867B (en) | 2024-04-12 |
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| CN201811478550.9A Active CN109406867B (en) | 2018-12-05 | 2018-12-05 | Residual current transformer signal acquisition circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406867B (en) * | 2018-12-05 | 2024-04-12 | 无锡蓝天电子股份有限公司 | Residual current transformer signal acquisition circuit |
| CN110739767B (en) * | 2019-11-12 | 2024-05-14 | 无锡蓝天电子股份有限公司 | Power management circuit of household fire alarm controller |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122900Y (en) * | 2007-11-28 | 2008-09-24 | 常熟开关制造有限公司(原常熟开关厂） | Alarm circuit of aftercurrent type electric fire disaster monitoring detector |
| CN201255760Y (en) * | 2008-09-11 | 2009-06-10 | 常熟开关制造有限公司(原常熟开关厂） | Sensing circuit for residue current transformer |
| CN204029100U (en) * | 2014-06-30 | 2014-12-17 | 镇江瑞清电子科技有限公司 | A kind of residual-current electrical fire monitor signal processing circuit |
| CN105092953A (en) * | 2015-09-17 | 2015-11-25 | 无锡蓝天电子有限公司 | Residual current detector and fire alarm system |
| CN109406867A (en) * | 2018-12-05 | 2019-03-01 | 无锡蓝天电子股份有限公司 | A kind of residual current transformer signal acquisition circuit |
-
2018
- 2018-12-05 CN CN201811478550.9A patent/CN109406867B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122900Y (en) * | 2007-11-28 | 2008-09-24 | 常熟开关制造有限公司(原常熟开关厂） | Alarm circuit of aftercurrent type electric fire disaster monitoring detector |
| CN201255760Y (en) * | 2008-09-11 | 2009-06-10 | 常熟开关制造有限公司(原常熟开关厂） | Sensing circuit for residue current transformer |
| CN204029100U (en) * | 2014-06-30 | 2014-12-17 | 镇江瑞清电子科技有限公司 | A kind of residual-current electrical fire monitor signal processing circuit |
| CN105092953A (en) * | 2015-09-17 | 2015-11-25 | 无锡蓝天电子有限公司 | Residual current detector and fire alarm system |
| CN109406867A (en) * | 2018-12-05 | 2019-03-01 | 无锡蓝天电子股份有限公司 | A kind of residual current transformer signal acquisition circuit |
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