CN219641881U - Elevator power failure emergency rescue device and magnetic latching relay contact adhesion detection circuit - Google Patents
Elevator power failure emergency rescue device and magnetic latching relay contact adhesion detection circuit Download PDFInfo
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- CN219641881U CN219641881U CN202320544427.2U CN202320544427U CN219641881U CN 219641881 U CN219641881 U CN 219641881U CN 202320544427 U CN202320544427 U CN 202320544427U CN 219641881 U CN219641881 U CN 219641881U
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- latching relay
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 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
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The utility model discloses an elevator power failure emergency rescue device and a magnetic latching relay contact adhesion detection circuit. The detection circuit comprises a control chip, a driving circuit and a state feedback circuit. The control chip outputs a pulse current signal through the driving circuit, switches the switching state of the magnetic latching relay in the main circuit, and judges the switching state of the magnetic latching relay according to the output of the state feedback circuit. The state feedback circuit comprises a second relay, a third relay and an optical coupling isolation circuit. One contact of the second relay and one contact of the third relay are respectively connected with two ends of one group of contacts of the magnetic latching relay, and the other contact forms an input loop of the optical coupling isolation circuit. When the magnetic latching relay is attracted, the input loop of the optical coupling isolation circuit is closed, a feedback signal is output, and when the magnetic latching relay is disconnected, the input loop of the optical coupling isolation circuit is disconnected, and no feedback signal is generated. Therefore, whether the contacts of the magnetic latching relay are adhered or not can be judged through the output of the optocoupler isolation circuit.
Description
Technical Field
The utility model belongs to the technical field of detection circuits, relates to circuit detection of an elevator power failure emergency rescue device, and in particular relates to an elevator power failure emergency rescue device and a magnetic latching relay contact adhesion detection circuit.
Background
In order to prevent power failure caused by failure of a mains supply circuit, elevator control cabinets on the market are generally powered by adopting a three-phase four-wire mode, and an elevator system is provided with an elevator power failure emergency rescue device (ARD). The ARD is used for switching the backup power supply to supply power for the elevator system when the mains supply circuit fails and fails, so as to achieve a safety device for automatic rescue. In an elevator system, mains supply passes through an ARD and then reaches a control cabinet to supply power.
In the switching control circuit of the ARD, there are two kinds of control devices commonly used, an ac contactor and a relay. A relay applied to an ARD switching control circuit is required to have a rated operating current of at least 50A at its contacts. The magnetic latching relay is paid attention to because of the advantages of large contact switching current, large bearing capacity, small volume, power saving and the like. Unlike other electromagnetic relays, the normally closed or normally open state of the magnetic latching relay is maintained completely depending on the action of the permanent magnet, and the switching of the switching state is completed by triggering a pulse electric signal of a certain width. The contact state of the magnetic latching relay is completely maintained by the magnetic force of the permanent magnet, so that the contact state is uncertain when the power is on each time, and in order to ensure the use safety, the contact state of the magnetic latching relay needs to be detected first, and then the switch state is switched by the pulse electric signal.
The magnetic latching relay of the prior art is provided with an auxiliary contact pushed by the armature portion for feeding back the switching state of the main contact. The magnetic latching relay mainly has the following defects: (1) foreign matters are easy to generate in the production and assembly process, the assembly reliability is not high, and the product performance is affected; (2) in the use process, if the armature part of the auxiliary contact is in failure with the push card of the main contact, the indication state is unreliable; (3) because the auxiliary contact is pushed by the armature part, the spring piece of the auxiliary contact is large in deformation, small in stress and easy to fracture and lose efficacy.
Therefore, a circuit capable of detecting the state of the magnetic latching relay contact of the ARD switching control circuit is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the elevator power failure emergency rescue device and the magnetic latching relay contact adhesion detection circuit, which are used for detecting the contact state of the magnetic latching relay of the switching control circuit of the elevator power failure emergency rescue device and resetting or alarming when the contact state is abnormal so as to ensure the power supply safety of an elevator system.
The magnetic latching relay contact adhesion detection circuit comprises a control chip, a driving circuit and a state feedback circuit. The control chip controls the driving circuit to output pulse current signals to the magnetic latching relay in the main circuit of the elevator system, switches the switching state of the magnetic latching relay, receives feedback signals output by the state feedback circuit and judges the switching state of the magnetic latching relay.
The state feedback circuit comprises a second relay, a third relay and an optical coupling isolation circuit. The optocoupler isolation circuit comprises an optocoupler isolator, an auxiliary voltage source, a resistor and a diode. The anode of the auxiliary voltage source is connected with the input end of the optocoupler isolator through a resistor, and the cathode of the auxiliary voltage source is connected with one contact of the third relay. The positive pole of the diode is connected with the other input end of the opto-coupler isolator, and the negative pole of the diode is connected with one contact of the second relay. The other contact of the second relay and the third relay are respectively connected with two ends of a group of contacts of the magnetic latching relay to form an input loop of the optical coupler isolator, and the control ends of the second relay and the third relay are connected with the control chip. The output end of the optical coupler isolator is connected with the control chip and outputs a feedback signal.
Preferably, the system further comprises a second state feedback circuit and a third state feedback circuit. In the second state feedback circuit and the third state feedback circuit, the relay and the optocoupler isolation circuit respectively form a loop with the other two groups of contacts of the magnetic latching relay, and an auxiliary voltage source in the optocoupler isolation circuit is an isolation voltage source.
The control chip firstly controls the driving circuit, outputs a pulse current signal to the magnetic latching relay in the main circuit of the elevator system, and switches the state of the pulse current signal to a normally open state. And then controlling the second and third relays to be conducted. If the magnetic latching relay contacts are normal, the input loop of the optical coupler isolator is opened because the magnetic latching relay is normally open, and the output end has no feedback signal. If the magnetic latching relay contacts are adhered, an input loop of the optocoupler isolator is closed, the optocoupler isolator outputs a feedback signal to the control chip, and the control chip judges that the magnetic latching relay contacts are adhered.
The utility model has the following beneficial effects:
compared with an auxiliary contact of the magnetic latching relay, the detection circuit formed by matching the power relay with the optocoupler isolator is simple in structure and low in assembly difficulty, the switch state of the magnetic latching relay can be effectively detected, whether the contact is adhered or not can be effectively detected, the reliability is higher, and the mechanical life is longer.
Drawings
Fig. 1 is a schematic diagram of an elevator power failure emergency rescue device in an embodiment;
FIG. 2 is a schematic diagram of a status feedback circuit according to an embodiment;
FIG. 3 is a flow chart of the magnetic latching relay contact adhesion detection of the ARD;
FIG. 4 is a schematic diagram of a state feedback circuit using multiple sets of states in an embodiment.
Detailed Description
The utility model is further explained below with reference to the drawings;
as shown in fig. 1, the elevator power failure emergency rescue device comprises a charging circuit, a discharging circuit, a voltage sampling circuit, a magnetic latching relay K1, a pulse driving circuit, a control chip and a state feedback circuit. Wherein the type of the magnetic latching relay K1 is HFE32-A/12-3DT1-R.
As shown in fig. 2, the status feedback circuit includes a second relay K2, a third relay K3, and an optocoupler isolation circuit. The optocoupler isolation circuit comprises an optocoupler isolator with the model of EL817, an auxiliary voltage source, a resistor R1 and a diode D2. The anode of the auxiliary voltage source is connected with the input end of the optocoupler isolator through a resistor R1, and the cathode of the auxiliary voltage source is connected with one contact of a third relay K3. The positive pole of the diode D2 is connected with the other input end of the optocoupler isolator, and the negative pole of the diode D2 is connected with one contact of the second relay K2. The other contacts of the second relay K2 and the third relay K3 are respectively connected with two ends of a group of contacts of the magnetic latching relay K1 to form an input loop of the optocoupler isolator, and the control ends of the second relay K2 and the third relay K3 are connected with the control chip. The output end of the optical coupler isolator is connected with the control chip and outputs a feedback signal. Since the ac voltage flowing through the contacts of the magnetic latching relay K1 is 380V and the rated operating current is large, the second and third relays K2, K3 are power relays, for example, the type JQC-3FF relay.
The control chip judges the switching state of the magnetic latching relay K1 through the feedback signal output by the optocoupler isolator. The specific method comprises the following steps: the control chip controls the second relay K2 and the third relay K3 to be conducted. When the magnetic latching relay K1 is disconnected, the input loop of the optical coupler isolator is open, so that the output end has no feedback signal, and the control chip judges that the magnetic latching relay K1 is in a normally open state. When the magnetic latching relay K1 is closed, the input loop of the optical coupler isolator is closed, so that the optical coupler isolator outputs a feedback signal to the control chip, and the control chip judges that the magnetic latching relay K1 is in a normally closed state.
The voltage sampling circuit collects three-phase voltage of the main circuit and transmits the three-phase voltage to the control chip, and the control chip judges whether the mains supply is normal or not. The three groups of contacts of the magnetic latching relay K1 are respectively arranged on three phase lines of the main circuit, and under the condition that the commercial power is normal, the control chip controls the pulse driving circuit to output pulse current signals, the magnetic latching relay K1 keeps a normally closed state, and the commercial power supplies working power to the elevator system through a magnetic latching relay contact loop and charges a backup power supply through a charging circuit. When the commercial power is abnormal, such as over-high voltage, over-low voltage or phase-lack and power failure, the control chip controls the pulse driving circuit to output a pulse current signal, the magnetic latching relay K1 is kept in a normally open state, and the switching discharge circuit provides a working power supply for the elevator system.
In order to ensure the operation safety of the elevator system, the control chip needs to check the contact condition of the magnetic latching relay K1 through a state feedback circuit before and after changing the state of the magnetic latching relay K1 through a pulse current signal every time. As shown in fig. 3, when the system is powered on, the control chip outputs a pulse current signal through the pulse driving circuit, controls the magnetic latching relay to be in a normally open state, the voltage sampling circuit collects three-phase voltage of the main circuit and transmits the three-phase voltage to the control chip, the control chip judges that the mains supply is abnormal and outputs fault information, otherwise, the control chip controls the second relay K2 and the third relay K3 to be conducted, judges the switching state of the magnetic latching relay K1 according to the output end signal of the opto-coupler isolator, if the magnetic latching relay K1 is conducted, the problem of contact adhesion exists, the control chip outputs fault signals, otherwise, the pulse driving circuit outputs the pulse current signal, and the magnetic latching relay K1 is switched to a normally closed state. The control chip continuously judges the state of the main circuit through the output data of the voltage sampling circuit, when the commercial power circuit is abnormal, a pulse current signal is output through the pulse driving circuit, the magnetic latching relay K1 is controlled to be in a normally open state, whether the magnetic latching relay K1 is disconnected or not is judged through the state feedback circuit, and if the magnetic latching relay K1 is disconnected, the backup power supply is controlled to supply power to the elevator system, and rescue is started; if the magnetic latching relay K1 is still attracted, a fault signal is output, and the magnetic latching relay K1 is reported to be in contact adhesion.
In the magnetic latching relay K1, the plurality of sets of contacts control state switching by the same set of mechanical structures. When the current flowing through the three sets of contacts in the main circuit is inconsistent, the load current of one set of contacts may exceed the design specification, so that the set of contacts are adhered and other contacts are normal, and in order to avoid the situation, the utility model provides a scheme as shown in fig. 4, and a second state feedback circuit and a third state feedback circuit are added. In the second state feedback circuit and the third state feedback circuit, the relay and the optocoupler isolation circuit respectively form a loop with the other two groups of contacts of the magnetic latching relay, and an isolation voltage source is selected as an auxiliary voltage source in the optocoupler isolation circuit. According to the scheme, three groups of contacts of the magnetic latching relay K1 can be independently detected, and failure detection failure caused by asynchronous actions of the three groups of contacts is avoided.
Claims (6)
1. The magnetic latching relay contact adhesion detection circuit is characterized in that: the device comprises a control chip, a driving circuit and a state feedback circuit; the control chip outputs a pulse current signal to a magnetic latching relay in a main circuit of the elevator system through the driving circuit, switches the switching state of the magnetic latching relay, receives a feedback signal output by the state feedback circuit, and judges the switching state of the magnetic latching relay;
the state feedback circuit comprises a second relay, a third relay and an optical coupler isolation circuit; the optocoupler isolation circuit comprises an optocoupler isolator, an auxiliary voltage source, a resistor and a diode; the positive electrode of the auxiliary voltage source is connected with the input end of the optocoupler isolator through a resistor, and the negative electrode of the auxiliary voltage source is connected with one contact of the third relay; the anode of the diode is connected with the other input end of the optocoupler isolator, and the cathode of the diode is connected with one contact of the second relay; the other contact of the second relay and the third relay are respectively connected with two ends of a group of contacts of the magnetic latching relay to form an input loop of the optical coupler isolator, and the control ends of the second relay and the third relay are connected with the control chip; the output end of the optical coupler isolator is connected with the control chip and outputs a feedback signal.
2. The magnetic latching relay contact adhesion detection circuit of claim 1, wherein: the type of the magnetic latching relay is HFE32-A/12-3DT1-R, and the type of the opto-coupler isolator is EL817.
3. The magnetic latching relay contact adhesion detection circuit of claim 1, wherein: the second relay and the third relay are power relays.
4. The magnetic latching relay contact adhesion detection circuit of claim 1, wherein: the model of the second relay and the third relay is JQC-3FF.
5. The magnetic latching relay contact adhesion detection circuit of any of claims 1, 3 or 4, wherein: the system also comprises a second state feedback circuit and a third state feedback circuit; in the second state feedback circuit and the third state feedback circuit, the relay and the optocoupler isolation circuit respectively form a loop with the other two groups of contacts of the magnetic latching relay, and an auxiliary voltage source in the optocoupler isolation circuit is an isolation voltage source.
6. Elevator power failure emergency rescue device, its characterized in that: the device comprises a charging circuit, a discharging circuit, a voltage sampling circuit, a magnetic latching relay K1, a pulse driving circuit, a control chip and a state feedback circuit as claimed in claim 1;
the voltage sampling circuit collects three-phase voltage of the main circuit and transmits the three-phase voltage to the control chip, and the control chip judges whether the mains supply is normal or not; three groups of contacts of the magnetic latching relay K1 are respectively arranged on three phase lines of the main circuit, and the control chip controls the switching state of the magnetic latching relay K1 through the pulse driving circuit; when the commercial power is normal, the magnetic latching relay K1 is kept in a normally closed state, the commercial power provides a working power supply for the elevator system through a contact loop of the magnetic latching relay, and meanwhile, the backup power supply is charged through a charging circuit; when the commercial power is abnormal, the magnetic latching relay K1 is kept in a normally open state, and the discharge circuit provides a working power supply for the elevator system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320544427.2U CN219641881U (en) | 2023-03-14 | 2023-03-14 | Elevator power failure emergency rescue device and magnetic latching relay contact adhesion detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320544427.2U CN219641881U (en) | 2023-03-14 | 2023-03-14 | Elevator power failure emergency rescue device and magnetic latching relay contact adhesion detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219641881U true CN219641881U (en) | 2023-09-05 |
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ID=87816975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320544427.2U Active CN219641881U (en) | 2023-03-14 | 2023-03-14 | Elevator power failure emergency rescue device and magnetic latching relay contact adhesion detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219641881U (en) |
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2023
- 2023-03-14 CN CN202320544427.2U patent/CN219641881U/en active Active
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