CN109193571B - Bus power failure monitoring protection circuit - Google Patents
Bus power failure monitoring protection circuit Download PDFInfo
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- CN109193571B CN109193571B CN201811151272.6A CN201811151272A CN109193571B CN 109193571 B CN109193571 B CN 109193571B CN 201811151272 A CN201811151272 A CN 201811151272A CN 109193571 B CN109193571 B CN 109193571B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 230000000007 visual effect Effects 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000003985 ceramic capacitor Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a bus power failure monitoring protection circuit, which comprises: the bus power supply input circuit is used for outputting the input bus power supply to the bus power supply output circuit after passing through the fault protection circuit; the power supply conversion circuit is used for generating a circuit working voltage based on the bus power supply and transmitting the circuit working voltage to the MCU controller circuit; the voltage measuring circuit is used for detecting the voltage value of the output end of the fault protection circuit and transmitting the voltage value to the MCU controller circuit; the current measuring circuit is used for detecting the current value of the output end of the fault protection circuit and transmitting the current value to the MCU controller circuit; the MCU controller circuit is used for judging whether a fault occurs according to the voltage value and the current value, controlling the fault protection circuit to act to protect the bus circuit when the fault occurs, and controlling the audible and visual alarm circuit to send out an audible and visual alarm signal.
Description
Technical Field
The invention relates to the technical field of power failure monitoring, in particular to a bus power failure monitoring protection circuit.
Background
At present, the electric fire monitoring equipment products of companies adopt a communication mode of two fire-fighting buses to perform a data communication function, and an auxiliary power supply of the monitoring equipment is also powered by the two buses; in product testing, it was found that if the auxiliary power source fails, normal communication between the devices would be affected. In order to improve the reliability of communication between devices, it is particularly important to design a bus power supply short-circuit and open-circuit fault monitoring protection function circuit.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides a bus power failure monitoring and protecting circuit.
The invention solves the technical problems by the following technical proposal:
the invention provides a bus power failure monitoring and protecting circuit which is characterized by comprising a bus power input circuit, a power conversion circuit, an MCU controller circuit, an audible and visual alarm circuit, a failure protecting circuit, a voltage measuring circuit, a current measuring circuit and a bus power output circuit;
the bus power supply input circuit is used for outputting the input bus power supply to the bus power supply output circuit after passing through the fault protection circuit;
the power supply conversion circuit is used for generating a circuit working voltage based on a bus power supply and transmitting the circuit working voltage to the MCU controller circuit;
the voltage measuring circuit is used for detecting the voltage value of the output end of the fault protection circuit and transmitting the voltage value to the MCU controller circuit;
the current measuring circuit is used for detecting a current value of the output end of the fault protection circuit and transmitting the current value to the MCU controller circuit;
the MCU controller circuit is used for judging whether a fault occurs according to the voltage value and the current value, controlling the fault protection circuit to act to protect the bus circuit when the fault occurs, and controlling the audible and visual alarm circuit to send out audible and visual alarm signals.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
when the bus power supply fails, the protection circuit can cut off the failed bus power supply from the bus and send out an audible and visual alarm signal at the same time, so that a user can conveniently check the failure on site, the bus communication function between other normal monitoring devices is ensured, and the reliability of the communication between the devices is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a bus power failure monitoring protection circuit according to a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of a portion of a bus power failure monitoring protection circuit according to a preferred embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of the MCU controller according to the preferred embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of an audible and visual alarm circuit according to a preferred embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present embodiment provides a bus power failure monitoring protection circuit, which includes a bus power input circuit 1, a power conversion circuit 2, an MCU controller circuit 3, an audible and visual alarm circuit 4, a failure protection circuit 5, a voltage measurement circuit 6, a current measurement circuit 7, and a bus power output circuit 8.
The bus power input circuit 1 is used for outputting an input bus power to the bus power output circuit after passing through the fault protection circuit.
The power conversion circuit 2 is configured to generate a circuit operation voltage based on a bus power supply and transmit the circuit operation voltage to the MCU controller circuit 3.
The voltage measurement circuit 6 is used for detecting the voltage value of the output end of the fault protection circuit and transmitting the voltage value to the MCU controller circuit 3.
The current measuring circuit 7 is used for detecting the current value of the output end of the fault protection circuit and transmitting the current value to the MCU controller circuit 3.
The MCU controller circuit 3 is used for judging whether a fault occurs according to the voltage value and the current value, and controlling the fault protection circuit 5 to act to protect the bus circuit when the fault occurs and controlling the audible and visual alarm circuit 4 to send out audible and visual alarm signals.
As shown in fig. 2, the bus power input circuit 1 includes a common-mode inductor L1 and a TVS tube VD1, the input end of the common-mode inductor L1 is connected to a fire-fighting two-bus, and the output end is connected in parallel with the TVS tube VD1 and then connected to a fault protection circuit 5.
As shown in fig. 2, the power conversion circuit 2 includes aluminum electrolytic capacitors C16, C23, ceramic capacitors C22, C24, C15, C19, resistors R22, R23, an inductor L3, a schottky diode D4, a chip integrated circuit U4 (ONSemi corporation LM 2576) and an LDO integrated circuit U3 (SIPEX corporation SPX 117-3.3), wherein the chip integrated circuit U4 generates a 5VDC power to supply an operating power to a relay in the fault protection circuit and a buzzer in the audible and visual alarm circuit, and the LDO integrated circuit U3 generates a 3.3VDC power to supply an operating power to the voltage measurement circuit, the current measurement circuit and the MCU controller circuit.
The first port of the patch integrated circuit U4 is respectively grounded through an aluminum electrolytic capacitor C16 and a ceramic capacitor C22, the third port and the fifth port are directly grounded, the second port is grounded through an inductor L3 and a 5V power supply is grounded, the fourth port of the patch integrated circuit U4 is grounded through a resistor R22 and a resistor R23, the second port of the patch integrated circuit U4 is connected with the cathode of a Schottky diode D4, and the anode of the Schottky diode D4 is grounded.
The third port of the LDO integrated circuit U3 is grounded through an aluminum electrolytic capacitor C23, a ceramic capacitor C24 and a ceramic capacitor C19 respectively, the first port is directly grounded, and the second port is connected with a 3.3V power supply and grounded through a ceramic capacitor C15.
As shown in fig. 3, the MCU controller circuit 3 is configured to determine whether the bus power supply is in a normal operating state or a fault state according to the voltage value and the current value, if a fault occurs, the MCU controller circuit 3 identifies whether the fault is an open-circuit fault or a short-circuit fault, and sends a control signal to the fault protection circuit through the I/O port, so that the fault protection circuit acts, thereby protecting the bus power supply from being damaged; meanwhile, the MCU controller circuit 3 sends a control signal to the audible and visual alarm circuit 4 through the I/O2 port to send an audible and visual alarm signal.
As shown in fig. 4, the audible and visual alarm circuit mainly includes 1 buzzer circuit and 2 light emitting diode circuits, when the bus power supply fails, the buzzer circuit gives out fault alarm sounds, and the 2 light emitting diode circuits respectively give out fault type alarm light signals according to the occurrence of short circuit or open circuit faults of the bus power supply, so that a field user can conveniently conduct fault investigation.
As shown in fig. 2, the fault protection circuit 5 includes resistors R14, R19, R6, R10, R1, R2, R3, ceramic capacitors C1, C2, C13, an optocoupler N1, a PNP transistor Q3, a PMOS transistor Q2, a piezoresistor RV2, a relay K1, a diode D1, and an NPN transistor Q1.
The first port of the optocoupler (N1) is connected with a bus_Opto control signal of the MCU control circuit through a resistor (R19), the first port of the optocoupler (N1) is grounded through a ceramic capacitor (C13), the second port of the optocoupler (N1) is directly grounded, the fourth port of the optocoupler (N1) is connected with an emitting electrode of a PNP triode (Q3), the third port of the optocoupler (N1) is connected with a base electrode of the PNP triode (Q3) through a resistor (R14), the emitting electrode of the PNP triode (Q3) is connected with an output end of the Bus power supply circuit, one end of the ceramic capacitor (C2) is connected with an emitting electrode of the PNP triode (Q3), the other end of the ceramic capacitor (C2) is connected with a base electrode of the PNP triode (Q3), one end of the resistor (R6) is connected with an emitting electrode of the PNP triode (Q3), the other end of the resistor (R6) is connected with a collecting electrode of the PNP triode (Q3), the grid electrode of the PMOS tube (Q2) is grounded through a resistor (R10), the grid electrode of the PMOS tube (Q2) is connected with a base electrode of the PNP triode (Q3), the grid electrode of the PMOS tube (Q2) is connected with the drain electrode of the PNP triode (Q3) through the fourth port of the PMOS (Q3), the grid electrode of the PMOS tube (Q2) is connected with the drain electrode of the PNP 3) and the third port of the PMOS relay (Q2) is connected with the fourth port (Q1) in parallel, a first port of a coil of the Relay (K1) is connected with a 5V working power supply, a second port of the coil of the Relay (K1) is connected with a collector of an NPN triode (Q1), a cathode of a diode (D1) is connected with the 5V working power supply, an anode of the diode (D1) is connected with a second port of the coil of the Relay (K1), an emitter of the NPN triode (Q1) is directly grounded, a base of the NPN triode (Q1) is grounded through a ceramic capacitor (C1), a base of the NPN triode (Q1) is connected with a bus_Relay control signal of an MCU control circuit through a resistor (R2), and the resistor (R1) pulls down the bus_Relay control signal of the MCU control circuit to be grounded.
When the break fault occurs, the MCU controller circuit sends a control signal bus_Opto through the I/O1 port, the optocoupler N1 is conducted, so that the PNP triode Q3 acts, after the PNP triode Q3 is conducted, the grid electrode of the PMOS tube Q2 is at a high level, and the PMOS tube Q2 is turned off at the moment, so that the connection between the Bus power supply and the Bus power supply output circuit is cut off.
When a short circuit fault occurs, the MCU controller circuit sends out a control signal bus_Relay, and the NPN triode Q1 is conducted, so that the Relay K1 acts, and the Bus power supply is prevented from being damaged due to overlarge current when the Bus power supply is in short circuit fault.
As shown in fig. 2, the voltage measuring circuit 6 measures the voltage value of the bus power supply, and sends the voltage value to the a/D1 port of the MCU controller circuit 3 after signal processing, and the MCU controller circuit 3 determines whether the bus power supply has a fault according to the voltage value.
As shown in fig. 2, the current measuring circuit 7 measures the current value of the bus power supply, sends the measured current value to the a/D2 port of the MCU controller circuit 3 after signal processing, and the MCU controller circuit 3 determines whether the bus power supply has a fault according to the current value.
As shown in fig. 2, the bus power output circuit 8 includes a TVS tube VD2, a common-mode inductor L2, a varistor RV1, and a gas discharge tube G1, where two ends of the varistor RV1 and the gas discharge tube G1 are connected in series and then connected to two ends of the bus power output circuit, and when the bus power output circuit receives interference signals such as static discharge and surge voltage, the varistor RV1 and the gas discharge tube G1 form a primary protection circuit, and the common-mode inductor L2 and the TVS tube VD2 form a secondary protection circuit, so that the power bus output circuit is further protected, and the anti-interference capability of the bus power is improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (7)
1. The bus power failure monitoring and protecting circuit is characterized by comprising a bus power input circuit, a power conversion circuit, an MCU controller circuit, an audible and visual alarm circuit, a failure protection circuit, a voltage measurement circuit, a current measurement circuit and a bus power output circuit;
the bus power supply input circuit is used for outputting the input bus power supply to the bus power supply output circuit after passing through the fault protection circuit;
the power supply conversion circuit is used for generating a circuit working voltage based on a bus power supply and transmitting the circuit working voltage to the MCU controller circuit;
the voltage measuring circuit is used for detecting the voltage value of the output end of the fault protection circuit and transmitting the voltage value to the MCU controller circuit;
the current measuring circuit is used for detecting a current value of the output end of the fault protection circuit and transmitting the current value to the MCU controller circuit;
the MCU controller circuit is used for judging whether a fault occurs according to the voltage value and the current value, controlling the fault protection circuit to act to protect the bus circuit when the fault occurs, and controlling the audible and visual alarm circuit to send out an audible and visual alarm signal;
the bus power supply input circuit comprises a common-mode inductor (L1) and a TVS tube (VD 1), wherein the input end of the common-mode inductor (L1) is connected with a fire-fighting two-bus, and the output end of the common-mode inductor is connected with the TVS tube (VD 1) in parallel and then connected with the fault protection circuit;
the fault protection circuit comprises resistors (R14, R19, R6, R10, R1, R2 and R3), ceramic capacitors (C1, C2 and C13), an optocoupler (N1), a PNP triode (Q3), a PMOS tube (Q2), a piezoresistor (RV 2), a relay (K1), a diode (D1) and an NPN triode (Q1);
the first port of the optocoupler (N1) is connected with a bus_Opto control signal of the MCU control circuit through a resistor (R19), the first port of the optocoupler (N1) is grounded through a ceramic capacitor (C13), the second port of the optocoupler (N1) is directly grounded, the fourth port of the optocoupler (N1) is connected with an emitting electrode of a PNP triode (Q3), the third port of the optocoupler (N1) is connected with a base electrode of the PNP triode (Q3) through a resistor (R14), the emitting electrode of the PNP triode (Q3) is connected with an output end of the Bus power supply circuit, one end of the ceramic capacitor (C2) is connected with an emitting electrode of the PNP triode (Q3), the other end of the ceramic capacitor (C2) is connected with a base electrode of the PNP triode (Q3), one end of the resistor (R6) is connected with an emitting electrode of the PNP triode (Q3), the other end of the resistor (R6) is connected with a collecting electrode of the PNP triode (Q3), the grid electrode of the PMOS tube (Q2) is grounded through a resistor (R10), the grid electrode of the PMOS tube (Q2) is connected with a base electrode of the PNP triode (Q3), the grid electrode of the PMOS tube (Q2) is connected with the drain electrode of the PNP triode (Q3) through the fourth port of the PMOS (Q3), the grid electrode of the PMOS tube (Q2) is connected with the drain electrode of the PNP 3) and the third port of the PMOS relay (Q2) is connected with the fourth port (Q1) in parallel, the first port of a coil of the Relay (K1) is connected with a 5V working power supply, the second port of the coil of the Relay (K1) is connected with the collector of an NPN triode (Q1), the cathode of the diode (D1) is connected with the 5V working power supply, the anode of the diode (D1) is connected with the second port of the coil of the Relay (K1), the emitter of the NPN triode (Q1) is directly grounded, the base of the NPN triode (Q1) is grounded through a ceramic capacitor (C1), the base of the NPN triode (Q1) is connected with a bus_Relay control signal of an MCU control circuit through a resistor (R2), and the resistor (R1) pulls down the bus_Relay control signal of the MCU control circuit to be grounded;
when an open-circuit fault occurs, the MCU controller circuit sends a control signal bus_Opto through an I/O1 port, the optocoupler (N1) is conducted, so that the PNP triode (Q3) acts, after the PNP triode (Q3) is conducted, the grid electrode of the PMOS tube (Q2) is high-level, and the PMOS tube (Q2) is turned off at the moment, so that the connection between a Bus power supply and the Bus power supply output circuit is cut off;
when a short circuit fault occurs, the MCU controller circuit sends out a control signal bus_Relay, and the NPN triode (Q1) is conducted, so that the Relay (K1) acts, and the Bus power supply is prevented from being damaged due to overlarge current when the Bus power supply is in short circuit fault.
2. The bus power failure monitoring protection circuit of claim 1, wherein the power conversion circuit includes an aluminum electrolytic capacitor (C16, C23), a ceramic capacitor (C22, C24, C15, C19), a resistor (R22, R23), an inductor (L3), a schottky diode (D4), a patch integrated circuit (U4), and an LDO integrated circuit (U3), wherein the patch integrated circuit (U4) generates a 5VDC power to provide an operating power to a relay in the failure protection circuit and a buzzer in the audible and visual alarm circuit, and the LDO integrated circuit (U3) generates a 3.3VDC power to provide an operating power to the voltage measurement circuit, the current measurement circuit, the MCU controller circuit;
the first port of the patch integrated circuit (U4) is grounded through an aluminum electrolytic capacitor (C16) and a ceramic capacitor (C22), the third port and the fifth port are directly grounded, the second port is connected with a 5V power supply through an inductor (L3), the fourth port of the patch integrated circuit (U4) is connected with the 5V power supply through a resistor (R22) and is also grounded through a resistor (R23), the second port of the patch integrated circuit (U4) is connected with the cathode of a Schottky diode (D4), and the anode of the Schottky diode (D4) is grounded;
the third port of the LDO integrated circuit (U3) is grounded through an aluminum electrolytic capacitor (C23), a ceramic capacitor (C24) and a ceramic capacitor (C19), the first port is directly grounded, and the second port is connected with a 3.3V power supply and grounded through a ceramic capacitor (C15).
3. The bus power failure monitoring and protecting circuit according to claim 1, wherein the MCU controller circuit is used for judging whether the bus power is in a normal working state or in a failure state according to the voltage value and the current value, if the MCU controller circuit is in failure, the MCU controller circuit distinguishes whether the bus power is in a disconnection failure or a short-circuit failure, and sends a control signal to the failure protecting circuit through the I/O port, so that the failure protecting circuit acts, and the bus power is protected from being damaged; meanwhile, the MCU controller circuit sends a control signal to the audible and visual alarm circuit through the I/O2 port to send an audible and visual alarm signal.
4. The bus power failure monitoring and protecting circuit according to claim 1, wherein the audible and visual alarm circuit mainly comprises 1 buzzer circuit and 2 light emitting diode circuits, when the bus power fails, the buzzer circuit gives out a failure alarm sound, and the 2 light emitting diode circuits respectively give out failure type alarm light signals according to the occurrence of short circuit or open circuit failure of the bus power.
5. The bus power failure monitoring and protecting circuit according to claim 1, wherein the voltage measuring circuit measures the voltage value of the bus power, and sends the measured voltage value to the A/D1 port of the MCU controller circuit after signal processing, and the MCU controller circuit judges whether the bus power fails according to the voltage value.
6. The bus power failure monitoring and protecting circuit according to claim 1, wherein the current measuring circuit measures the current value of the bus power, the current value is sent to the A/D2 port of the MCU controller circuit after signal processing, and the MCU controller circuit judges whether the bus power fails according to the current value.
7. The bus power failure monitoring and protecting circuit according to claim 1, wherein the bus power output circuit comprises a TVS tube (VD 2), a common mode inductor (L2), a varistor (RV 1) and a gas discharge tube (G1), wherein after the varistor (RV 1) and the gas discharge tube (G1) are connected in series, both ends of the bus power output circuit are respectively connected, and when the bus power output circuit receives interference signals such as static discharge and surge voltage, the varistor (RV 1) and the gas discharge tube (G1) form a primary protection circuit, and the common mode inductor (L2) and the TVS tube (VD 2) form a secondary protection circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811151272.6A CN109193571B (en) | 2018-09-29 | 2018-09-29 | Bus power failure monitoring protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811151272.6A CN109193571B (en) | 2018-09-29 | 2018-09-29 | Bus power failure monitoring protection circuit |
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| CN109193571A CN109193571A (en) | 2019-01-11 |
| CN109193571B true CN109193571B (en) | 2024-03-12 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110086142B (en) * | 2019-04-25 | 2024-07-12 | 瑞纳智能设备股份有限公司 | MBUS node group-based protection device |
| CN111044573B (en) * | 2019-11-28 | 2022-04-08 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
| CN112953480A (en) * | 2019-12-11 | 2021-06-11 | 浙江正泰电器股份有限公司 | Circuit breaker accessory protection module |
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| CN204167883U (en) * | 2014-10-25 | 2015-02-18 | 西安科技大学 | A kind of 10kV line short fault microcomputer protective relay device |
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| CN209046247U (en) * | 2018-09-29 | 2019-06-28 | 江苏斯菲尔电气股份有限公司 | Bus power source malfunction monitoring protects circuit |
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| CN103779833A (en) * | 2014-02-21 | 2014-05-07 | 朱志伟 | DC leakage current detection and protection circuit and detection and protection method |
| CN204167883U (en) * | 2014-10-25 | 2015-02-18 | 西安科技大学 | A kind of 10kV line short fault microcomputer protective relay device |
| CN107069953A (en) * | 2017-02-27 | 2017-08-18 | 上海华宿电气股份有限公司 | A kind of monitoring system based on power bus information |
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