CN107658970B - Relay protection circuit for fire-fighting equipment power supply - Google Patents
Relay protection circuit for fire-fighting equipment power supply Download PDFInfo
- Publication number
- CN107658970B CN107658970B CN201711090388.9A CN201711090388A CN107658970B CN 107658970 B CN107658970 B CN 107658970B CN 201711090388 A CN201711090388 A CN 201711090388A CN 107658970 B CN107658970 B CN 107658970B
- Authority
- CN
- China
- Prior art keywords
- power supply
- relay
- fire
- coil
- electrolytic capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Relay Circuits (AREA)
- Protection Of Static Devices (AREA)
Abstract
A relay protection circuit for fire-fighting equipment power supply, this circuit includes MCU and relay K1, when the fire-fighting equipment power supply detects the voltage disconnection of alternating current electric wire netting, needs to switch the main power supply of fire-fighting equipment power supply to stand-by power supply, under MCU's control, relay K1 actuation, with stand-by power supply and power output intercommunication the coil power supply end of relay K1 has diode D2 in series, and the parallelly connected electrolytic capacitor C1 that has in relay K1 coil both ends.
Description
Technical Field
The invention belongs to the technical field of fire-fighting equipment, and particularly relates to a relay protection circuit for a fire-fighting equipment power supply.
Background
In the existing national standard GB 28184-2011 'fire-fighting equipment power supply monitoring system', when the alternating-current power grid voltage and standby power switching control is involved, the following regulations are provided:
4.2.1.3 monitor Power should be provided with a main power supply and a standby power supply. When the fluctuation range of the power supply voltage of the alternating current power grid is 85-110% of the rated voltage 220V, the monitor can work normally.
The power supply portion of 4.2.1.4 monitors should have both main and standby power conversion functions. When the main power supply is disconnected, the power supply can be automatically switched to the standby power supply; when the main power supply is recovered, the power supply can be automatically switched to the main power supply; the switching between the main and the standby power supply should not affect the normal operation of the monitor.
In the field of fire-fighting equipment, there is a need for switching between a main power supply and a standby power supply for the power supply used, and a relay is usually used in the switching circuit. Such as the circuit shown in fig. 1. BT1 is a backup battery, and when the fire fighting device detects that power switching is required, the power switching is completed through a relay. When the main power supply of the fire-fighting equipment power supply is disconnected, the fire-fighting equipment power supply is automatically switched to a standby power supply to work, and when the power supply works to output 20A or 30A current, a standby power fuse F1 in the switching circuit is respectively 20A or 30A. The fuse tube is not instantaneously fused when overcurrent flows, the overcurrent is different in magnitude, and the corresponding fusing time is different. The 20A fuse is taken as an example of the fuse blowing time: at 80A current, 100-600ms fuses; at 200A current, 50-80ms fuses. For the short-circuit current of the fire-fighting equipment, when the 24V standby power output is short-circuited, the short-circuit current of the line is 40-100A due to different internal resistances of the wires. Fig. 1 is a general relay operation circuit. Hereinafter, a brief description will be made of the operation of the circuit of fig. 1.
Fig. 1 shows a common relay working circuit, when Q1 is turned on, the relay works, the normally open contact K1 inside the relay is closed, and the circuit outputs 24V voltage. When the output is short-circuited, the fuse tube has fusing time, the voltage of the relay working coil is reduced due to the output short-circuit before the fuse tube is not fused, so that the closing force of the relay contact K1 is gradually reduced, the relay K1 contact is further opened, and at the moment of opening the relay K1 contact, the voltage of the relay working coil is raised to 24V again due to the fact that the fuse tube is not fused at the moment, the relay is sucked again, and the K1 contact is contacted again; because the output short circuit is continuous, the relay can circularly generate K1 contact closing and opening phenomena for a plurality of times before the fuse tube is not fused; because the output short-circuit current of the battery pack is very large by 40-100A, the K1 contact is closed and opened for many times, and the K1 contact of the relay can be burnt.
It can be seen that the above circuit is prone to burn out the relay K1 contacts when the output is shorted when the 24V battery is in operation using a common relay. Even if a high-priced car-level high-current relay is used, there is still a risk of burning out the relay K1 contacts.
Disclosure of Invention
The invention provides a relay protection circuit for a fire-fighting equipment power supply, which aims to solve the problem that a common relay is easy to burn when in output short circuit and high current switching in the prior art.
A relay protection circuit for fire-fighting equipment power supply, this circuit includes MCU and relay K1, when the fire-fighting equipment power supply detects the voltage disconnection of alternating current electric wire netting, needs to switch the main power supply of fire-fighting equipment power supply to stand-by power supply, under MCU's control, relay K1 actuation, with stand-by power supply and power output intercommunication relay K1's coil power supply end has diode D2 in series, and relay K1 coil both ends have electrolytic capacitor C1 parallelly connected.
Further, the coil input end of the relay K1 is connected with the negative electrode of the diode D2, the negative electrode of the diode D2 is connected with the positive electrode of the electrolytic capacitor C1, and the negative electrode of the electrolytic capacitor C1 is connected with the coil output end of the relay K1.
Further, the IO control output end of the MCU controls the opening and closing of the relay K1 through a switch semiconductor tube.
Further, the switch semiconductor tube is a triode Q1, the base electrode of the triode Q1 is connected with the IO control output end of the MCU through a resistor R1, the collector electrode of the triode Q1 is connected with the cathode of the electrolytic capacitor C1 and is also connected with the coil output end of the relay K1,
The diode D1 is connected to two ends of a coil of the relay K1 in parallel, the negative electrode of the diode D1 is connected with the positive electrode of the electrolytic capacitor C1, and the positive electrode of the diode D1 is connected with the negative electrode of the electrolytic capacitor C1.
Further, the standby power supply is connected in series to the contact input end of the relay K1 through a fuse F1.
Further, the backup power source is a 24V battery pack.
In the invention, a forward diode D2 for supplying power to a coil driven by a relay K1 and an electrolytic capacitor C1 connected with two ends of the coil in parallel are added in the existing relay working circuit. When the 24V battery pack works, the contact of the relay K1 can be effectively protected from being burnt when the output is short-circuited. The low-cost common relay can be adopted in the power supply switching circuit of the fire-fighting equipment, so that the cost of the equipment is effectively reduced. In the invention, the electrolytic capacitor C1 is connected in parallel with the two ends of the coil of the relay K1 in an inverse conventional way, and the closing action time of the relay is delayed and does not meet the working requirement of a common relay, but in the field of fire-fighting equipment power supply, the circuit of the invention meets the main and standby power switching requirements of the fire-fighting equipment power supply, so that the common relay can be suitable for being used in the fire-fighting equipment power supply circuit.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
fig. 1 is a schematic diagram of a conventional power supply switching control circuit of a fire-fighting device.
Fig. 2 is a schematic diagram of a fire-fighting equipment power supply switching control circuit of the present invention.
Detailed Description
As shown in fig. 2, the relay protection circuit for the power supply of the fire-fighting equipment comprises an MCU and a relay K1, when the fire-fighting equipment detects that the voltage of an alternating current power grid is disconnected and the main power supply of the fire-fighting equipment needs to be switched to a standby power supply, the relay K1 in the protection circuit is attracted under the control of the MCU, and the standby power supply is communicated with the power supply output.
The two ends of a coil of a relay K1 in the circuit are connected with an electrolytic capacitor C1 in parallel, a base electrode of a triode Q1 is connected with an IO control output end of an MCU through a resistor R1, a collector electrode of the triode Q1 is connected with a negative electrode of the electrolytic capacitor C1, and the collector electrode of the triode Q1 is also connected to the coil output end of the relay K1. The coil input end of the relay K1 is connected with the cathode of the diode D2, the cathode of the diode D2 is connected with the anode of the electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is connected with the coil output end of the relay K1, the diode D1 is connected to the coil output ends of the relay K1 in parallel, the cathode of the diode D1 is connected with the anode of the electrolytic capacitor C1, and the anode of the diode D1 is connected with the cathode of the electrolytic capacitor C1. The standby power supply is connected in series with the input contact of the relay K1 through a fuse F1. The standby power supply is a 24V battery pack. The capacitance of the electrolytic capacitor C1 is 100 uF-470 uF, the maximum voltage is born at two ends of the electrolytic capacitor C1, the opening time of the relay contact K1 after the output is short-circuited is exemplified as follows,
When the C1 capacitance is 220uF, the K1 off time is prolonged to 300ms; the C1 capacitance was 470uF and the K1 off time was extended to 650ms.
The invention adds a diode D2 for supplying power to the coil of the relay K1 and an electrolytic capacitor C1 connected with the coil of the relay K1 in parallel in the existing relay working circuit. When Q1 is conducted, the standby power 24V voltage charges the electrolytic capacitor C1 through the diode D2, after the electrolytic capacitor C1 is full of 24V voltage, the relay works, the normally open contact K1 in the relay is closed, the circuit outputs 24V voltage, when the output is short-circuited, the fuse has fusing time, before the fuse is not fused, the energy storage of the electrolytic capacitor C1 is released due to the reverse non-conducting characteristic of the diode D2, the power can only be supplied to the working coil of the relay, the 24V voltage reduction time is prolonged, the contact K1 in the relay is kept closed before the fuse is fused, the contact K1 is still in a closed state along with the fusing time of the fuse, and the contact K1 of the relay can not be closed and opened circularly for many times when the fuse is fused, so that the contact K1 of the relay can be effectively protected from being burnt.
It is to be understood that while the spirit and principles of the invention have been described in connection with several embodiments, it is to be understood that this invention is not limited to the specific embodiments disclosed nor does it imply that the features of these aspects are not combinable and that such is for convenience of description only. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (3)
1. A relay protection circuit for a fire-fighting equipment power supply comprises an MCU and a relay K1, when the fire-fighting equipment power supply detects that the voltage of an alternating current power grid is disconnected, the main power supply of the fire-fighting equipment power supply is required to be switched to a standby power supply, the relay K1 is attracted under the control of the MCU to communicate the standby power supply with the power supply output, the relay protection circuit is characterized in that a diode D2 is connected in series with the coil power supply end of the relay K1, an electrolytic capacitor C1 is connected in parallel with the two ends of the coil of the relay K1,
The coil input end of the relay K1 is connected with the cathode of the diode D2, the cathode of the diode D2 is connected with the anode of the electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is connected with the coil output end of the relay K1,
The IO control output end of the MCU controls the opening and closing of the relay K1 through a switch semiconductor tube,
The switch semiconductor tube is a triode Q1, the base electrode of the triode Q1 is connected with the IO control output end of the MCU through a resistor R1, the collector electrode of the triode Q1 is connected with the cathode of the electrolytic capacitor C1 and is also connected with the coil output end of the relay K1,
The diode D1 is connected to two ends of a coil of the relay K1 in parallel, the negative electrode of the diode D1 is connected with the positive electrode of the electrolytic capacitor C1, and the positive electrode of the diode D1 is connected with the negative electrode of the electrolytic capacitor C1.
2. The relay protection circuit for a fire apparatus power supply according to claim 1, wherein the backup power supply is connected in series to a contact input terminal of the relay K1 through a fuse F1.
3. The relay protection circuit for a fire apparatus power supply of claim 2, wherein the backup power supply is a 24V battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711090388.9A CN107658970B (en) | 2017-11-08 | 2017-11-08 | Relay protection circuit for fire-fighting equipment power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711090388.9A CN107658970B (en) | 2017-11-08 | 2017-11-08 | Relay protection circuit for fire-fighting equipment power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107658970A CN107658970A (en) | 2018-02-02 |
| CN107658970B true CN107658970B (en) | 2024-05-14 |
Family
ID=61120929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711090388.9A Active CN107658970B (en) | 2017-11-08 | 2017-11-08 | Relay protection circuit for fire-fighting equipment power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107658970B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098656B (en) * | 2019-05-07 | 2020-11-20 | 六安市同心畅能电子科技有限公司 | Automatic charging energy-saving control circuit for emergency standby power supply of fire alarm system |
| CN113655749B (en) * | 2021-08-26 | 2023-03-28 | 杭州并坚科技有限公司 | Fire power supply main and standby power switching control circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11120883A (en) * | 1997-10-16 | 1999-04-30 | Toshiba Corp | Contact point deterioration preventive device |
| KR20020046121A (en) * | 2000-12-12 | 2002-06-20 | 정태영 | Stabilizer protector for dischange lamp |
| CN204270979U (en) * | 2014-09-12 | 2015-04-15 | 浙江水利水电学院 | A kind of unicoil magnetic latching relay driving circuit |
| CN204794950U (en) * | 2015-07-25 | 2015-11-18 | 浙江金控电气有限公司 | Buffering fire control drive circuit |
| CN106130172A (en) * | 2016-07-28 | 2016-11-16 | 福州米立科技有限公司 | Battery supply set emergency standby power accesses protection system |
| CN207382048U (en) * | 2017-11-08 | 2018-05-18 | 柏宜照明（上海）股份有限公司 | A kind of relay protection circuit for fire-fighting equipment power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7196435B2 (en) * | 2003-04-03 | 2007-03-27 | Goodrich Corporation | Solid state relay and method of operating the same |
-
2017
- 2017-11-08 CN CN201711090388.9A patent/CN107658970B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11120883A (en) * | 1997-10-16 | 1999-04-30 | Toshiba Corp | Contact point deterioration preventive device |
| KR20020046121A (en) * | 2000-12-12 | 2002-06-20 | 정태영 | Stabilizer protector for dischange lamp |
| CN204270979U (en) * | 2014-09-12 | 2015-04-15 | 浙江水利水电学院 | A kind of unicoil magnetic latching relay driving circuit |
| CN204794950U (en) * | 2015-07-25 | 2015-11-18 | 浙江金控电气有限公司 | Buffering fire control drive circuit |
| CN106130172A (en) * | 2016-07-28 | 2016-11-16 | 福州米立科技有限公司 | Battery supply set emergency standby power accesses protection system |
| CN207382048U (en) * | 2017-11-08 | 2018-05-18 | 柏宜照明（上海）股份有限公司 | A kind of relay protection circuit for fire-fighting equipment power supply |
Non-Patent Citations (1)
| Title |
|---|
| 不同保护电路对继电器电寿命的影响及实验研究;郭凤仪等;中国电机工程学报(第31期);77-82 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107658970A (en) | 2018-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106992550B (en) | Control device and collection flow box | |
| CN100583571C (en) | Full-function secure plug | |
| CN204333938U (en) | A kind of short circuit current restriction and protective device | |
| CN102369644A (en) | Control circuit for preventing battery group from being reversely connected and power supply system for base station | |
| CN107658970B (en) | Relay protection circuit for fire-fighting equipment power supply | |
| CN107834695B (en) | Fire-fighting equipment power supply with relay protection circuit | |
| CN201877368U (en) | Electromagnetic switch of starter | |
| CN204858537U (en) | Battery discharge short -circuit protection circuit | |
| CN101964278A (en) | Electromagnetic switch for starter | |
| CN104953537A (en) | Overload protection switching device | |
| CN217406169U (en) | Switch protection circuit, switch box and energy storage assembly | |
| CN203481822U (en) | Closed loop power supply model of medium voltage 10 kilovolt power distribution network | |
| CN206650419U (en) | Electrical fuse circuit for load control | |
| CN202917939U (en) | Short circuit protection circuit | |
| CN207382048U (en) | A kind of relay protection circuit for fire-fighting equipment power supply | |
| CN207382049U (en) | A kind of fire-fighting equipment power supply with relay protection circuit | |
| CN211075542U (en) | High-voltage system of vehicle and vehicle | |
| CN201638340U (en) | Fire prevention pre-alarm device for machine room of base station | |
| CN202817875U (en) | Improved emergency lighting switching device | |
| CN204886124U (en) | Prevent overload protection switching device | |
| CN210608671U (en) | Power supply switching device and electric power auxiliary equipment | |
| CN221328665U (en) | High-voltage distribution box for energy storage system | |
| CN203339651U (en) | Multifunctional air switch | |
| CN204203306U (en) | Single group storage battery volume test protective device | |
| CN203301120U (en) | Burnt-up proof automatic protection device for high voltage circuit breaker opening and closing coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240617 Address after: No. 3719, West Section of Cuihu Sixth Road, Economic Development Zone, Tongling City, Anhui Province, 244002 Patentee after: Baiyi Electric (Tongling) Co.,Ltd. Country or region after: China Address before: 1188 Jiuye Road, Qingpu District, Shanghai, 201712 Patentee before: BAIYI LIGHTING (SHANGHAI) HOLDINGS Ltd. Country or region before: China |