CN110763373A - Monitoring alarm circuit with protection and self-recovery functions - Google Patents
Monitoring alarm circuit with protection and self-recovery functions Download PDFInfo
- Publication number
- CN110763373A CN110763373A CN201911091166.8A CN201911091166A CN110763373A CN 110763373 A CN110763373 A CN 110763373A CN 201911091166 A CN201911091166 A CN 201911091166A CN 110763373 A CN110763373 A CN 110763373A
- Authority
- CN
- China
- Prior art keywords
- current
- monitoring
- alarm
- alarm circuit
- standard
- 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.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 75
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 238000002955 isolation Methods 0.000 claims description 13
- 230000001052 transient effect Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 101100001471 Schizosaccharomyces pombe (strain 972 / ATCC 24843) alm1 gene Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D7/00—Indicating measured values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Alarm Systems (AREA)
Abstract
The invention provides a monitoring alarm circuit with protection and self-recovery functions, which comprises: a sensor (1) for acquiring monitoring data; an alarm loop (7) for prompting the monitoring data to exceed the standard; the MCU (2) is connected with the sensor and the alarm loop and used for receiving the monitoring data and controlling the alarm loop; a current sampling element (8) for acquiring current data of the alarm loop; a monostable flip-flop (9) connected to the current sampling element; and the logic operation unit (5) is connected between the alarm loop and the MCU and is connected with the output end of the monostable trigger. The monitoring alarm circuit can automatically limit the current of the alarm circuit after the current exceeds the standard, thereby protecting the sensor and the circuit. And the current of the alarm loop can be automatically recovered after being recovered to be normal without manual recovery.
Description
Technical Field
The invention relates to a monitoring alarm circuit, in particular to a monitoring alarm circuit with protection and self-recovery functions.
Background
As shown in fig. 1, the existing monitoring alarm circuit is composed of a sensor 1 for acquiring monitoring data; an alarm loop 7 for prompting that the monitoring data exceeds the standard; the device comprises a MCU2 connected with the sensor 1 and the alarm loop 7 and used for receiving the monitoring data and controlling the alarm loop 7, and an isolation element 6 connected between the MCU2 and the alarm loop 7 and used for separating strong current and weak current, wherein the isolation element 6 usually adopts an optical coupler, a triode and the like. When the monitoring data exceeds the standard, the MCU2 controls the alarm loop 7 to generate prompt information, thereby realizing the monitoring alarm function. The current and power consumption in the alarm loop 7 are determined by the system environment used by the sensor 1, and when the system is abnormal or fails, the alarm loop 7 can generate large current to damage the sensor 1 and even the whole monitoring alarm circuit.
Therefore, a monitoring alarm circuit with protection and self-recovery functions is needed.
Disclosure of Invention
The invention aims to provide a monitoring alarm circuit with protection and self-recovery functions, so as to solve the defects in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a monitoring alarm circuit of area protection and self-resuming function, it includes:
a sensor for acquiring monitoring data;
the alarm loop is used for prompting that the monitoring data exceeds the standard;
the MCU is connected with the sensor and the alarm loop and used for receiving the monitoring data and controlling the alarm loop;
a current sampling element for acquiring current data of the alarm loop;
the monostable trigger is connected with the current sampling element, and outputs a level to turn over when the current data exceeds the standard and enters a transient state from a steady state;
and the logic operation unit is connected between the alarm loop and the MCU, is connected with the output end of the monostable trigger, and is used for carrying out logic operation on the level from the MCU and the level from the monostable trigger so as to control the alarm loop, so that the alarm loop outputs alarm information after the monitoring data exceeds the standard and the alarm loop is intermittently shut off after the current data exceeds the standard so as to limit the current data.
When the monitoring data exceeds the standard, the MCU outputs a control level, the logic operation unit controls the alarm circuit to be connected, and alarm information is generated to prompt that the monitoring data exceeds the standard. When the current of the alarm loop is increased and exceeds the standard, the input of the monostable trigger is changed, the output level of the monostable trigger is reversed and is temporarily maintained and then recovered again (namely the monostable trigger works in a transient state), the alarm loop is controlled to be switched on after being temporarily switched off after the monostable trigger is subjected to logical operation by the logical operation unit, and the process is automatically repeated before the current of the alarm loop is not recovered to be normal, so that the aims of limiting the current of the alarm loop and protecting the circuit are fulfilled. When the current of the alarm circuit is recovered to be normal, the input of the monostable trigger is kept in a state, and the monostable trigger enters a stable state, so that the automatic recovery of the monitoring alarm circuit is realized.
Preferably, the logic operation unit is an and gate.
Preferably, the monitoring alarm circuit further comprises a prompting unit for prompting that the current data exceeds the standard.
Preferably, the prompting unit is a first LED connected to an output end of the monostable flip-flop, the first LED flashes when the current data exceeds a standard and a flashing frequency becomes faster with an increase of the current data, and the first LED continuously emits light when the current data increases to a certain value.
Preferably, the monitoring alarm circuit further comprises a display unit connected with the MCU for displaying the monitoring data.
Preferably, an isolation element for isolating strong and weak electricity is provided between the alarm circuit and the logic operation unit.
Preferably, an isolation element for isolating strong current and weak current is disposed between the monostable flip-flop and the current sampling element.
Preferably, the isolation element is an optocoupler.
Preferably, the sensor is a pressure sensor, the monitoring alarm circuit comprises two alarm loops, two current sampling elements, two monostable triggers and two logic operation units, and automatic prompt, overcurrent protection and automatic recovery can be realized when high voltage exceeds standard or low voltage exceeds standard.
Compared with the prior art, the invention has at least the following beneficial effects:
the monitoring alarm circuit can automatically limit the current of the alarm circuit after the current exceeds the standard, thereby protecting the sensor and the circuit. And the current of the alarm loop can be automatically recovered after being recovered to be normal without manual recovery.
Drawings
FIG. 1 is a schematic block diagram of a prior art monitoring alarm circuit;
FIG. 2 is a schematic block diagram of a first embodiment of the monitoring alarm circuit with protection and self-recovery functions of the present invention;
FIG. 3 is a schematic block diagram of a second embodiment of the monitoring alarm circuit with protection and self-recovery functions according to the present invention;
FIG. 4 is a circuit diagram of the MCU, the display unit, and the prompt unit;
FIG. 5 is a circuit diagram of a current sampling element, a monostable flip-flop, a logic operation unit, and an alarm loop;
reference numerals: 1. a sensor; 2. MCU; 3. a display unit; 4. a presentation unit; 5. a logical operation unit; 6. an isolation element; 7. an alarm loop; 8. a current sampling element; 9. a monostable flip-flop; 10. a 100V-24V power converter; 11. a 24V-3.3V power converter; 12. a resistive-capacitive timing element.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The first embodiment:
referring to fig. 2, the monitoring alarm circuit with protection and self-recovery functions includes: a sensor 1 for acquiring monitoring data; an alarm loop 7 for prompting that the monitoring data exceeds the standard; the MCU2 is connected with the sensor 1 and the alarm loop 7 and is used for receiving the monitoring data and controlling the alarm loop 7; a current sampling element 8 for acquiring current data of the alarm loop 7; a monostable trigger 9 which is connected with the current sampling element 8, and when the output level of the current data exceeds the standard, the current data is inverted and enters a transient state from a steady state; and the logic operation unit 5 is connected between the alarm loop 7 and the MCU2, is connected with the output end of the monostable trigger 9, and is used for carrying out logic operation on the level from the MCU2 and the level from the monostable trigger 9 so as to control the alarm loop 7, so that the alarm loop 7 outputs alarm information after the monitoring data exceeds the standard and the alarm loop 7 is intermittently turned off after the current data exceeds the standard so as to limit the current data.
The working principle is as follows: when the monitoring data exceeds the standard, the MCU2 outputs a control level, the logic operation unit 5 controls the alarm loop 7 to be connected, and alarm information is generated to prompt that the monitoring data exceeds the standard. When the current of the alarm loop 7 increases and exceeds the standard, the input of the monostable trigger 9 is changed, the output level of the monostable trigger is reversed and is recovered again after being maintained for a short time (namely, the monostable trigger 9 works in a transient state), the alarm loop 7 is controlled to be switched on after being switched off for a short time after the logic operation of the logic operation unit 5, the process is automatically repeated before the current of the alarm loop 7 is recovered to be normal, namely, the alarm loop 7 is judged intermittently, and therefore the purposes of limiting the current of the alarm loop 7 and protecting the circuit are achieved. When the current of the alarm circuit 7 is recovered to be normal, the input of the monostable trigger 9 maintains a state, the monostable trigger 9 enters a steady state, and a high level is continuously output, so that the automatic recovery of the monitoring alarm circuit is realized.
The monitoring alarm circuit further comprises a prompting unit 4 for prompting that the current data exceeds the standard. The prompting unit 4 may be any one or more of a sound generating device, a light emitting device, and a display device. The prompting unit 4 is preferably connected to an output end of the monostable trigger 9, and is preferably an LED, because the monostable trigger 9 works in a transient state after current data (namely, current of the alarm circuit 7) exceeds a standard, the LED connected to the output end of the monostable trigger 9 works in a flashing state, the higher the current of the alarm circuit 7 is, the higher the frequency of the monostable trigger 9 entering the transient state is, the higher the flashing frequency of the LED is, and the LED continuously emits light after the current data increases to a certain value, so that by the scheme, a worker can intuitively judge the severity of the exceeding of the current through the flashing frequency of the LED.
The monitoring alarm circuit further comprises a display unit 3 connected with the MCU2 for displaying the monitoring data.
An isolating element 6 for isolating strong and weak current is further provided between the alarm circuit 7 and the logic operation unit 5. An isolation element 6 for isolating strong and weak currents is provided between the monostable flip-flop 9 and the current sampling element 8. The isolation element 6 is preferably an optocoupler.
Second embodiment:
referring to fig. 3, the monitoring alarm circuit with protection and self-recovery functions includes: a sensor 1 for acquiring monitoring data; an alarm loop 7 for prompting that the monitoring data exceeds the standard; the MCU2 is connected with the sensor 1 and the alarm loop 7 and is used for receiving the monitoring data and controlling the alarm loop 7; a current sampling element 8 for acquiring current data of the alarm loop 7; a monostable trigger 9 which is connected with the current sampling element 8, and when the output level of the current data exceeds the standard, the current data is inverted and enters a transient state from a steady state; and the logic operation unit 5 is connected between the alarm loop 7 and the MCU2, is connected with the output end of the monostable trigger 9, and is used for carrying out logic operation on the level from the MCU2 and the level from the monostable trigger 9 so as to control the alarm loop 7, so that the alarm loop 7 outputs alarm information after the monitoring data exceeds the standard and the alarm loop 7 is intermittently turned off after the current data exceeds the standard so as to limit the current data.
The sensor 1 is a pressure sensor 1, and is provided with two alarm circuits 7, two current sampling elements 8, two monostable triggers 9 and two logic operation units 5, which form two groups, wherein each group is a group in a dashed line frame in fig. 3, and the two groups are respectively used for monitoring and alarming high voltage and low voltage so as to automatically prompt, protect against overcurrent and automatically recover when the high voltage exceeds the standard or the low voltage exceeds the standard.
The monitoring alarm circuit further comprises a prompting unit 4 for prompting that the current data exceeds the standard. The prompting unit 4 may be any one or more of a sound generating device, a light emitting device, and a display device. The prompting unit 4 is preferably connected to an output end of the monostable trigger 9, and is preferably an LED, because the monostable trigger 9 works in a transient state after current data (namely, current of the alarm circuit 7) exceeds a standard, the LED connected to the output end of the monostable trigger 9 works in a flashing state, the higher the current of the alarm circuit 7 is, the higher the frequency of the monostable trigger 9 entering the transient state is, the higher the flashing frequency of the LED is, and the LED continuously emits light after the current data increases to a certain value, so that by the scheme, a worker can intuitively judge the severity of the exceeding of the current through the flashing frequency of the LED.
The monitoring alarm circuit further comprises a display unit 3 connected with the MCU2 for displaying the monitoring data.
An isolating element 6 for isolating strong and weak current is further provided between the alarm circuit 7 and the logic operation unit 5. An isolation element 6 for isolating strong and weak currents is provided between the monostable flip-flop 9 and the current sampling element 8.
Fig. 4 and 5 show specific circuits. Fig. 4 includes the circuit of the MCU2, the display unit 3, the prompt unit 4, and the 24V-3.3V power converter 11, and fig. 5 includes the circuit of the current sampling element 8, the monostable trigger 9, the logic operation unit 5, the alarm circuit 7, and the 100V-24V power converter 10.
Referring to fig. 4, the MCU2 adopts a chip with a model of PIC 16F1782, the display unit 3 is a four-digit nixie tube, the prompt unit 4 includes two groups of LEDs, one group corresponds to high voltage, the other group corresponds to low voltage, each group includes two LEDs, one LED is connected to the output end of the monostable trigger 9 for prompting that the current of the alarm loop 7 exceeds the standard, and the other LED is connected to the MCU2 for prompting that the pressure (i.e., the data monitored by the sensor) exceeds the standard. IN fig. 4, the IN terminal is used for connecting the sensor 1, and the current signal output by the sensor is converted into a voltage signal by the chip OPA347 and is input to the MCU 2. The 24V-3.3V power converter 11 is composed of a triode, a chip AZ432 and the like, and converts 24V direct current into 3.3V to supply power to the MCU2 and other chips.
Referring to fig. 5, an alarm circuit 7 includes a transistor Q1 and a resistor R3, and the resistor R3 constitutes a current sampling element 8 of the alarm circuit. The other alarm loop 7 comprises a triode Q3 and a resistor R6, and the resistor R6 forms a current sampling element 8 of the alarm loop. The monostable flip-flop 9 employs a chip 74HC123, which includes two monostable flip-flops therein. In this embodiment, the logic operation unit 5 is specifically an and gate, and employs a chip 74LVC2G 08. The isolation element 6 employs an optocoupler.
The working principle is as follows: the pressure sensor 1 monitors pressure data, inputs the pressure data into the MCU2, and displays the pressure data through a four-digit nixie tube (the display unit 3). When the pressure data exceeds the lower limit, the MCU2 outputs an alarm level ALM1 (high level), the alarm level controls the LED lamp to be lighted on to generate prompt information on one hand, and transmits the prompt information to an AND gate (logic operation unit 5) on the other hand, the AND gate outputs high level, the AND gate is isolated by an optocoupler U2 and then controls a triode Q1 to be conducted, and the alarm loop 7 is connected. When the current of the alarm loop 7 increases and exceeds the standard, the triode Q2 is conducted, the input of the monostable trigger 9 is controlled to change through the optocoupler U3, the output level of the monostable trigger 9 is overturned from high level to low level and restores to high level again after short-term maintenance, so that the output of the AND gate is converted into low level and restores to high level again after short-term maintenance, and further the triode Q1 in the alarm loop 7 is turned off for a short time (the time for disconnection can be flexibly designed by designing the resistance-capacitance timing element 12 on the periphery of the monostable trigger 9), the process can be automatically repeated before the current of the alarm loop 7 is not restored to normal, thereby achieving the purposes of limiting the current of the alarm loop 7 and protecting the circuit, in addition, in the process, the monostable trigger 9 outputs a pulse signal, and the frequency of the pulse signal increases along with the increase of the current of the alarm loop 7, therefore, the current exceeding degree of the alarm loop 7 can be intuitively known through the flashing speed of the LED (prompting unit 4). When the current of the alarm circuit 7 is recovered to be normal, the input of the monostable trigger 9 maintains a state, the monostable trigger 9 enters a steady state, and a high level is continuously output, so that the automatic recovery of the monitoring alarm circuit is realized.
When the pressure data exceeds the upper limit, the MCU2 outputs an alarm level ALM2 to control the other path to realize alarm, the principle is the same as that after the pressure data exceeds the lower limit, and the description is omitted here.
The monitoring alarm circuit can be integrated on a circuit board and connected with a corresponding sensor to form a monitoring alarm device, for example: the pressure gauge is connected with the pressure sensor to form a pressure gauge, and the temperature monitoring device is connected with the temperature sensor to form a temperature monitoring device, and the like.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for the purpose of helping those skilled in the art understand the present invention, and is not to be construed as limiting the scope of the present invention. Various modifications, equivalent changes, etc. made by those skilled in the art under the spirit of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a monitoring alarm circuit of area protection and self-resuming function, includes:
a sensor (1) for acquiring monitoring data;
an alarm loop (7) for prompting the monitoring data to exceed the standard;
the MCU (2) is connected with the sensor (1) and the alarm loop (7) and is used for receiving the monitoring data and controlling the alarm loop (7);
it is characterized by also comprising:
a current sampling element (8) for acquiring current data of the alarm loop (7);
a monostable trigger (9) which is connected with the current sampling element (8), and when the output level of the current data exceeds the standard, the current data is inverted and enters a transient state from a steady state;
and the logic operation unit (5) is connected between the alarm loop (7) and the MCU (2), is connected with the output end of the monostable trigger (9), and is used for carrying out logic operation on the level from the MCU (2) and the level from the monostable trigger (9) so as to control the alarm loop (7) to ensure that the alarm loop (7) outputs alarm information after the monitoring data exceeds the standard and intermittently shuts off the alarm loop (7) to limit the current data after the current data exceeds the standard.
2. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 1, wherein: the logic operation unit (5) is an AND gate.
3. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 1, wherein: the monitoring alarm circuit further comprises a prompting unit (4) used for prompting that the current data exceeds the standard.
4. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 3, wherein: the prompting unit (4) is a first LED connected to the output end of the monostable trigger (9), the first LED flickers after the current data exceeds the standard, the flickering frequency is increased along with the increase of the current data, and the first LED continuously emits light after the current data increases to a certain value.
5. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 1, wherein: the monitoring alarm circuit further comprises a display unit (3) which is connected with the MCU (2) and used for displaying the monitoring data.
6. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 1, wherein: an isolation element (6) for isolating strong current and weak current is arranged between the alarm loop (7) and the logic operation unit (5).
7. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 1, wherein: an isolation element (6) for isolating strong current and weak current is arranged between the monostable trigger (9) and the current sampling element (8).
8. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 6 or 7, wherein: the isolation element (6) is an optocoupler.
9. The monitoring alarm circuit with protection and self-recovery functions as claimed in claim 1, wherein: the sensor (1) is a pressure sensor, the monitoring alarm circuit comprises two alarm loops (7), two current sampling elements (8), two monostable triggers (9) and two logic operation units (5), and the monitoring alarm circuit can automatically prompt, protect against overcurrent and automatically recover when high voltage exceeds standard or low voltage exceeds standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911091166.8A CN110763373A (en) | 2019-11-09 | 2019-11-09 | Monitoring alarm circuit with protection and self-recovery functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911091166.8A CN110763373A (en) | 2019-11-09 | 2019-11-09 | Monitoring alarm circuit with protection and self-recovery functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110763373A true CN110763373A (en) | 2020-02-07 |
Family
ID=69337103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911091166.8A Pending CN110763373A (en) | 2019-11-09 | 2019-11-09 | Monitoring alarm circuit with protection and self-recovery functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110763373A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0555962A (en) * | 1991-08-28 | 1993-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Method and device for recovering fault of metallic cable line |
| CN101702510A (en) * | 2009-11-19 | 2010-05-05 | 上海第二工业大学 | Home-use self-recovering leakage-current alarm and power-failure protection device |
| CN201528186U (en) * | 2009-10-13 | 2010-07-14 | 孙卫东 | Electric appliance safety protector with fixed power consumption |
| CN201974894U (en) * | 2011-03-22 | 2011-09-14 | 淄博职业学院 | Anti-theft alarm circuit |
| CN108735321A (en) * | 2018-06-22 | 2018-11-02 | 江苏核电有限公司 | A kind of control loop power supply is in alarm device and its verification method |
| CN210426830U (en) * | 2019-11-09 | 2020-04-28 | 深圳市欧利德仪器仪表有限公司 | Monitoring alarm circuit with protection and self-recovery functions |
-
2019
- 2019-11-09 CN CN201911091166.8A patent/CN110763373A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0555962A (en) * | 1991-08-28 | 1993-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Method and device for recovering fault of metallic cable line |
| CN201528186U (en) * | 2009-10-13 | 2010-07-14 | 孙卫东 | Electric appliance safety protector with fixed power consumption |
| CN101702510A (en) * | 2009-11-19 | 2010-05-05 | 上海第二工业大学 | Home-use self-recovering leakage-current alarm and power-failure protection device |
| CN201974894U (en) * | 2011-03-22 | 2011-09-14 | 淄博职业学院 | Anti-theft alarm circuit |
| CN108735321A (en) * | 2018-06-22 | 2018-11-02 | 江苏核电有限公司 | A kind of control loop power supply is in alarm device and its verification method |
| CN210426830U (en) * | 2019-11-09 | 2020-04-28 | 深圳市欧利德仪器仪表有限公司 | Monitoring alarm circuit with protection and self-recovery functions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100474044C (en) | Power supply system and liquid crystal display device having the same | |
| US9048685B2 (en) | Emergency lighting with charging indicator circuitry | |
| CN106210666A (en) | A kind of photographic head failover device and method | |
| CN111045356B (en) | Method and circuit for realizing hot plug of industrial robot demonstrator | |
| CN108055029A (en) | A kind of on-off circuit and the electronic equipment with the on-off circuit | |
| CN210426830U (en) | Monitoring alarm circuit with protection and self-recovery functions | |
| CN209785529U (en) | LED display driving circuit, display and driving chip | |
| CN205248227U (en) | Multichannel fusing of metal alarm instruction circuit | |
| CN110763373A (en) | Monitoring alarm circuit with protection and self-recovery functions | |
| CN101835313B (en) | LED control device with current monitoring function | |
| CN101630489B (en) | Power supply circuit of liquid crystal display | |
| CN204479726U (en) | The indicating fault control circuit of the two redundant electrical pow er supply system of a kind of airplane signal lamp | |
| CN112180183A (en) | State monitoring circuit and method for vehicle-mounted electronic equipment | |
| CN109848960B (en) | Hot plug circuit for industrial robot demonstrator and control method thereof | |
| CN2912171Y (en) | TV set having integrated fault auto checking and alarming circuit | |
| CN106026054B (en) | One kind outputing self-checking circuit | |
| CN211015788U (en) | Visual single-machine circuit of secondary screen cabinet alarm signal of transformer substation | |
| CN210604869U (en) | Wire rod pin detection circuit and wire rod pin detection system | |
| CN203465345U (en) | External voltage automatic detection and alarm circuit | |
| CN203387751U (en) | A subway shield door unit controller | |
| CN205283877U (en) | Light source controller of a plurality of cameras of simultaneous control and a plurality of light sources | |
| CN212063619U (en) | Relay power supply switching circuit based on photoelectric coupling | |
| CN108390667B (en) | Indicating circuit for light-operated automatic switching on/off | |
| CN214755485U (en) | DC power supply voltage monitoring circuit | |
| CN203260867U (en) | USB connection line with status display function |
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 |