CN214255704U - Anti-electromagnetic interference protection device and intelligent lock - Google Patents
Anti-electromagnetic interference protection device and intelligent lock Download PDFInfo
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- CN214255704U CN214255704U CN202023113518.6U CN202023113518U CN214255704U CN 214255704 U CN214255704 U CN 214255704U CN 202023113518 U CN202023113518 U CN 202023113518U CN 214255704 U CN214255704 U CN 214255704U
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Abstract
The utility model relates to an anti-electromagnetic interference protection device and intelligent lock belongs to intelligent lock technical field, has solved current intelligent lock and has received electromagnetic interference and lead to the problem that intelligent lock was opened by violence. The anti-electromagnetic interference protection device comprises: the electromagnetic pulse induction module is arranged in the shell of the protected equipment, and induces electromagnetic induction current when a system circuit of the protected equipment is subjected to electromagnetic interference, wherein the system circuit comprises a motor control module and a system power supply; the discharge circuit is electrically connected between the electromagnetic pulse induction module and the grounding end; the isolation circuit is connected with the discharge circuit and the switch circuit and controls the switch circuit to disconnect the system power supply from the motor control module; the switching circuit is connected with the isolation circuit and the switching circuit is connected at a protected port between the system power supply and the motor control module. The system circuit realizes the induced current discharge and simultaneously controls the switch circuit to disconnect the system power supply from the motor control module and the lock control motor module so as to protect the intelligent door lock.
Description
Technical Field
The utility model relates to an intelligence lock technical field especially relates to an anti-electromagnetic interference protection device and intelligent lock.
Background
Along with more and more intelligent lock manufacturers, intelligent lock products are more and more widely applied, more families select to install the intelligent lock products, but some problems still exist in the safety of the intelligent lock products.
In the prior art, intelligent door lock products of several brands can be successively opened through a small black box, and the fastest intelligent door lock product only takes 3 seconds. The small black box is a Tesla coil and is a distributed parameter high-frequency series resonance transformer. The principle is a device that boosts a general voltage using a transformer and then discharges the voltage from a discharge terminal via a two-pole coil. The Tesla coil can generate strong electromagnetic pulses to cause strong interference on a circuit of an intelligent door lock product, so that a motor control module in the intelligent door lock product is halted and then restarted. Some intelligent door lock products are in an automatic unlocking state when being restarted by default; in addition, the strong radio frequency electromagnetic interference can also directly generate pulse interference at the control end of the unlocking circuit, so that the system is mistaken for a normal unlocking instruction, and the driving motor is started to unlock; strong electromagnetic interference can also directly interfere with the control end of the motor driving circuit, and the motor driving clutch is directly started to unlock.
To prevent the intelligent door lock from being interfered by electromagnetism, Electromagnetic shielding is needed to be conducted on sensitive signals when a circuit is designed, the door lock is set to be in a closing state by default when a motor control module is halted and restarted, meanwhile, the EMI (Electromagnetic Interference) performance of the circuit is also considered, and the integrity of a power supply and the integrity of the ground are well achieved. Even so, it is difficult to ensure complete resistance to external strong electromagnetic interference.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the utility model aims at providing an anti-electromagnetic interference protection device and intelligent lock for solve current intelligent lock and receive electromagnetic interference and lead to the problem that intelligent lock was opened by violence.
The purpose of the utility model is mainly realized through the following technical scheme:
an anti-electromagnetic interference protection device comprising: the electromagnetic pulse induction module is arranged in the shell of the protected equipment and used for inducing electromagnetic induction current when a system circuit of the protected equipment is subjected to electromagnetic interference, wherein the system circuit comprises a motor control module and a system power supply; the discharge circuit is electrically connected between the electromagnetic pulse induction module and a grounding end; the isolation circuit is connected with the discharge circuit and the switch circuit and controls the switch circuit to disconnect the system power supply from the motor control module; and a switching circuit connected with the isolation circuit and connected at a protected port between the system power supply and the motor control module.
The beneficial effects of the above scheme are as follows: the large electromagnetic induction current is discharged to the grounding end through the discharge circuit, so that the influence of transient overvoltage and overcurrent on a system circuit and electronic components on the system circuit is inhibited, and the function of resisting an electromagnetic pulse protection circuit is achieved. The anti-electromagnetic interference protection device is isolated from the system circuit through the isolation circuit so as to isolate the discharge circuit from the switch circuit, thereby preventing electronic components in the system circuit from being broken down, and the switch circuit disconnects a system power supply from the motor control module under the control of the isolation circuit so as to protect the system circuit of the intelligent door lock.
Based on the further improvement of the above scheme, the electromagnetic pulse induction module comprises an antenna, wherein the antenna is used for converting the electromagnetic interference signal into the electromagnetic induction current.
Based on the further improvement of the scheme, the discharge circuit comprises one diode or a plurality of parallel diodes, wherein the anodes of the one or more diodes are connected with the antenna in the electromagnetic pulse induction module; and the cathode of the diode is connected with the grounding end.
Based on a further improvement of the above solution, the number of diodes is determined according to the power of the electromagnetic interference.
Based on the further improvement of the scheme, the anti-electromagnetic interference protection device further comprises a filter, wherein one end of the filter is connected to the antenna; and the other end of the filter is connected to the anode of the one or more diodes.
Based on the further improvement of the scheme, the isolation circuit is an optical coupler which comprises a light emitting diode and a phototriode which are packaged together, wherein the anode of the light emitting diode is connected with the anodes of the one or more diodes; the cathode of the light emitting diode is connected with the cathode of the one or more diodes; and the collector of the phototriode is connected with the switch circuit and the emitter of the phototriode is connected with the grounding terminal.
Based on a further improvement of the above scheme, the switch circuit comprises an NMOS switch, a PMOS switch, a first resistor and a second resistor, wherein a gate of the NMOS switch is connected to a collector of the phototransistor and a first end of the first resistor, respectively; the source electrode of the NMOS switch is connected with the grounding end; the drain electrode of the NMOS switch is respectively connected with the grid electrode of the PMOS switch and the first end of the second resistor; a source of the PMOS switch connected to the second end of the first resistor, the second end of the second resistor, and the system power supply, respectively; and the drain electrode of the PMOS switch is connected with the motor control module.
Based on the further improvement of the scheme, the isolation circuit comprises a reverse loop diode, a rectifier diode and a relay, wherein one terminal of a coil of the relay is connected with a cathode of the rectifier diode; the other terminal of the coil of the relay and the anode of the reverse loop diode are connected with the grounding terminal; anodes of the rectifier diodes are respectively connected with anodes of the one or more diodes and cathodes of the reverse loop diodes; the first wiring end of the normally open contact of the relay is connected with the switch circuit; and the second terminal of the normally open contact of the relay is connected with the grounding terminal.
Based on further improvement of the scheme, the switch circuit comprises an NMOS switch, a PMOS switch, a first resistor and a second resistor, wherein the grid electrode of the NMOS switch is respectively connected with the first terminal of the normally open contact of the relay and the first end of the first resistor; the source electrode of the NMOS switch is connected with the grounding end; the drain electrode of the NMOS switch is respectively connected with the grid electrode of the PMOS switch and the first end of the second resistor; a source of the PMOS switch connected to the second end of the first resistor, the second end of the second resistor, and the system power supply, respectively; and the drain electrode of the PMOS switch is connected with the motor control module.
An intelligent lock comprises the anti-electromagnetic interference protection device.
The intelligent lock also comprises a system circuit connected with the anti-electromagnetic interference protection device; the system circuit comprises a motor control module, a lock control motor module and a system power supply.
Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:
1. the larger electromagnetic induction current is discharged to the grounding end through the discharge circuit, so that the influence of transient overvoltage and overcurrent on a system circuit and electronic components on the system circuit of the intelligent door lock is inhibited, and the function of an electromagnetic pulse resistant protection circuit is achieved. The anti-electromagnetic interference protection device is isolated from the system circuit through the isolation circuit so as to prevent electronic components in the system circuit from being broken down, and the switch circuit disconnects the system power supply from the motor control module and the lock control motor module under the control of the isolation circuit so as to protect the system circuit of the intelligent door lock.
2. One diode or a plurality of parallel diodes provide a low-impedance discharge path to the grounding terminal for large current, and the plurality of parallel diodes can meet the requirement that high-power current discharges to the grounding terminal.
3. The anti-electromagnetic interference protection device can be isolated from the system circuit through the optical coupler or the relay, and the influence of high-power current in the discharge circuit on the switch circuit is avoided.
4. The switch circuit is controlled through the optical coupler or the relay, so that when the system is subjected to strong electromagnetic interference, a system power supply and the motor control module are timely disconnected through the switch circuit to protect a system circuit of the intelligent door lock; when the system is not interfered by strong electromagnetic interference, the switch circuit is normally conducted to enable the system circuit to normally work.
The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
Fig. 1 is a block diagram of an anti-electromagnetic interference protection device according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a system circuit of an intelligent door lock according to an embodiment of the present invention.
Fig. 3 is a structural diagram of an anti-electromagnetic interference protection device according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an anti-electromagnetic interference protection device according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an anti-electromagnetic interference protection device according to another embodiment of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
The utility model discloses a concrete embodiment discloses an anti-electromagnetic interference protection device. Referring to fig. 1, the anti-electromagnetic interference protection apparatus includes: the electromagnetic pulse induction module 102 is arranged in a shell of a protected device (such as an intelligent door lock) and is used for inducing electromagnetic induction current when a system circuit of the protected device is subjected to electromagnetic interference, wherein the system circuit comprises a motor control module and a system power supply; a discharge circuit 104 electrically connected between the electromagnetic pulse induction module 102 and a ground terminal; an isolation circuit 106 connected to the discharge circuit and the switch circuit 108 and controlling the switch circuit 108 to disconnect the system power supply from the motor control module to isolate the discharge circuit 104 from the switch circuit 108; and a switching circuit 108 connected to the isolation circuit 106, and the switching circuit 108 is connected at a protected port between the system power supply and the motor control module.
Compared with the prior art, the anti-electromagnetic interference protection device provided by the embodiment discharges a larger electromagnetic induction current to the grounding end through the discharge circuit, thereby inhibiting the influence of transient overvoltage and overcurrent on the system circuit of the intelligent door lock and electronic components on the system circuit, and playing a role in anti-electromagnetic pulse protection circuit. The anti-electromagnetic interference protection device is isolated from the system circuit through the isolation circuit so as to prevent electronic components in the system circuit from being broken down, and the switch circuit disconnects the system power supply from the motor control module and the lock control motor module under the control of the isolation circuit so as to protect the system circuit of the intelligent door lock.
Hereinafter, the anti-electromagnetic interference protection apparatus will be described in detail with reference to fig. 1, 4 and 5. Referring to fig. 1, the anti-electromagnetic interference protection apparatus includes: an electromagnetic pulse induction module 102, a filter, a discharge circuit 104, an isolation circuit 106, and a switching circuit 108. Optionally, the electromagnetic interference protection device further includes a filter, one end of the filter is connected to the electromagnetic pulse induction module 102, and the other end of the filter is connected to the discharge circuit 104.
Referring to fig. 4 or 5, a magnetic pulse induction module 102 is disposed in the housing of the protected device, and is configured to induce an electromagnetic induction current when a system circuit of the protected device (e.g., a smart door lock) is subjected to electromagnetic interference. The system circuit of the intelligent door lock comprises a motor control module and a system power supply. Specifically, the housing of the intelligent door lock comprises a plurality of small holes, and the magnetic pulse induction module 102 is arranged to be close to the plurality of small holes in the housing of the intelligent door lock and receive the electromagnetic interference signal through the plurality of small holes. The electromagnetic pulse induction module comprises an antenna, wherein the antenna is used for converting electromagnetic interference signals into electromagnetic induction currents.
One end of the filter is connected to the antenna; and the other end of the filter is connected to the anode of one or more diodes. For example, referring to fig. 4 and 5, the filter may include a capacitor. Specifically, one end of the capacitor is connected to the antenna; and the other end of the capacitor is connected to the anode of the one or more diodes.
Referring to fig. 4 or 5, the discharge circuit 104 is electrically connected between the electromagnetic pulse induction module 102 and a ground terminal. The discharge circuit 104 includes one diode or a plurality of diodes D1(1, 2, … N) connected in parallel, wherein the anode of one or more of the diodes is connected to the antenna in the electromagnetic pulse induction module. The cathodes of the one or more diodes are connected to ground. The number of diodes is determined according to the power of the electromagnetic interference, and the model number of the diodes is 1N 4007.
Compared with the prior art, the protection device applied to the anti-electromagnetic interference provided by the embodiment provides a low-impedance discharge path to the grounding end for large current through one diode or a plurality of parallel diodes, and the plurality of parallel diodes can meet the requirement that the high-power current discharges to the grounding end. The discharging circuit comprises a plurality of parallel diodes D1, when the electromagnetic induction current is small, the electromagnetic induction current is directly discharged to the grounding end through a plurality of parallel diodes D1, no current flows into the isolating circuit, so that the light emitting diode of the optical coupler U1 of the isolating circuit can not emit light, therefore, the phototriode can not be conducted, and the normal work of the switching circuit can not be influenced. In addition, the coil of the relay of the isolation circuit is not charged enough, so that the normally open contact of the relay cannot be closed, and the normal work of the switch circuit cannot be influenced. On the contrary, when the electromagnetic induction current is large, the phototriode of the optical coupler U1 is turned on, or the normally open contact of the relay is closed, so that the NMOS switch and the PMOS switch in the switch circuit are both turned off, the system power supply and the motor control module are disconnected, and the system circuit of the intelligent door lock is in a protected state (a locked state).
Referring to fig. 1, an isolation circuit 106 is connected to the discharge circuit 104 and the switch circuit 108 and controls the switch circuit 108 to disconnect the system power supply from the motor control module to isolate the discharge circuit 104 from the switch circuit 108. The discharge circuit 104 is coupled between the electromagnetic pulse induction module 102 and the isolation circuit 106. Specifically, the isolation circuit 106 may be an optocoupler U1 or a relay KJ. Hereinafter, the optical coupler U1 and the relay KJ are described in detail with reference to fig. 4 and 5, respectively.
Referring to fig. 4, the isolation circuit is an optocoupler U1. The optocoupler U1 includes a light emitting diode and a phototransistor packaged together. Specifically, the anode of the light emitting diode is connected to the anode of one or more diodes D1. The cathode of the light emitting diode is connected to the cathode of one or more diodes D1. The collector of the phototransistor is connected to the switching circuit 108 and the emitter of the phototransistor is connected to ground. Alternatively, the optical coupler is model VOMA 617A.
Referring to fig. 5, the isolation circuit includes a reverse loop diode D2, a rectifier diode D3, and a relay KJ. Specifically, one terminal of the coil of the relay KJ is connected to the cathode of the rectifier diode D3. The other terminal of the coil of the relay KJ and the anode of the reverse loop diode D2 are connected to the ground terminal. The anodes of the rectifier diodes D3 are connected to the anode of one or more diodes D1 and the cathode of the reverse loop diode D2, respectively. And the first terminal of the normally open contact of the relay is connected with the switch circuit. And the second terminal of the normally open contact of the relay is connected with the grounding terminal.
Compared with the prior art, the anti-electromagnetic interference protection device that this embodiment provided can keep apart anti-electromagnetic interference protection device and the system circuit of intelligent lock through optical coupler or relay, avoids the influence of the high-power electric current in the discharge circuit to switching circuit.
Referring to fig. 1 and 2, the switching circuit 108 is connected to the isolation circuit 106, and the switching circuit 108 is connected at the protected port between the system power supply and the motor control module. A PMOS switch Q2 sets the protected port. Hereinafter, referring to fig. 4 and 5, the connection of the optical coupler U1 and the relay KJ to the switch circuit is described in detail, respectively.
Referring to fig. 4, the switch circuit 108 includes an NMOS switch Q1, a PMOS switch Q2, a first resistor R1, and a second resistor R2. The gate of the NMOS switch Q1 is connected to the collector of the phototransistor and the first end of the first resistor R1, respectively. The source of the NMOS switch Q1 is connected to ground. The drain of the NMOS switch Q1 is connected to the gate of the PMOS switch Q2 and the first end of the second resistor R2, respectively. A source of the PMOS switch Q2 is connected to the second terminal of the first resistor R1, the second terminal of the second resistor R2, and the system power supply, respectively. And the drain electrode of the PMOS switch Q2 is connected with the motor control module and the lock control motor module.
Referring to fig. 5, the switch circuit includes an NMOS switch Q1, a PMOS switch Q2, a first resistor R1, and a second resistor R2. The gate of the NMOS switch Q1 is connected to the first terminal of the normally open contact of the relay KJ and the first end of the first resistor R1, respectively. The source of the NMOS switch Q1 is connected to ground. The drain of the NMOS switch Q1 is connected to the gate of the PMOS switch Q2 and the first end of the second resistor R2, respectively. A source of the PMOS switch Q2 is connected to the second terminal of the first resistor R1, the second terminal of the second resistor R2, and the system power supply, respectively. And the drain electrode of the PMOS switch Q2 is connected with the motor control module and the lock control motor module. Optionally, the first resistor and the second resistor have a resistance value between 200K Ω and 1M Ω. Optionally, the first resistor and the second resistor have a resistance of 200K Ω.
Compared with the prior art, the anti-electromagnetic interference protection device provided by the embodiment can timely disconnect the system power supply and the motor control module through the switch circuit to protect the system circuit of the intelligent door lock when the system suffers strong electromagnetic interference through the optical coupler or the relay control switch circuit; when the system is not interfered by strong electromagnetic interference, the switch circuit is normally conducted to enable the system circuit to normally work.
It should be noted that, the anti-electromagnetic interference protection device in this embodiment may be applied to an intelligent door lock, and may also be applied to other devices that need to avoid electromagnetic interference, and is not limited to an intelligent door lock. For example, it may be used in smart car locks, industrial controls, safes, or other applications where electromagnetic interference resistance is desired.
The utility model discloses a concrete embodiment discloses an intelligent lock. The intelligent lock comprises the anti-electromagnetic interference protection device in the above embodiment. The intelligent lock also comprises a system circuit connected with the anti-electromagnetic interference protection device; the system circuit comprises a motor control module, a lock control motor module and a system power supply.
The utility model discloses a concrete embodiment discloses an anti-electromagnetic interference's protection method. The respective steps of the protection method against electromagnetic interference are described in detail.
When a system circuit of a protected device is subjected to electromagnetic interference, electromagnetic induction current is induced, wherein the system circuit comprises a system power supply and a motor control module. The electromagnetically induced current discharges to ground via a discharge circuit. Specifically, before the electromagnetically induced current is discharged to the ground by the discharge circuit, the method further comprises: the DC component of the electromagnetic induction current is removed and the AC component is retained. The switch circuit is controlled to be opened to avoid breakdown of electronic components in the system circuit. By disconnecting the switching circuit, the connection between the system power supply and the motor control module is disconnected to protect the system circuit. Specifically, the isolation circuit is caused to output a control signal to control the switching circuit to be in an off state while the electromagnetically induced current is discharged to the ground by the discharge circuit.
In addition, when no electromagnetic interference exists, the discharge circuit and the isolation circuit stop working, and the switch circuit is in a conducting state, so that the system power supply is electrically connected with the motor control module and the lock control motor module, and the motor control module and the lock control motor module work normally.
Hereinafter, with reference to fig. 2 and 3, the anti-electromagnetic interference protection apparatus is described in detail by way of specific examples.
The main objective of this application is to provide a prevent the system circuit of intelligent lock that forceful electric magnetic interference unblanked, has realized that the intelligent lock product still can be avoided to the technological effect of unblanking even the intelligent lock product is in under strong electromagnetic interference's environment.
The application provides an anti-electromagnetic interference protection device for preventing violent electromagnetic interference from violently unlocking. Fig. 2 is a block diagram of a system circuit of the intelligent door lock.
The smart door lock portion includes: the system comprises a system power supply, a motor control module and a lock control motor module. The protection circuit part includes: the device comprises an electromagnetic pulse induction part, a discharge circuit, an isolation circuit and a switch circuit.
The system power supply is used for providing a power supply for the whole intelligent door lock circuit;
the motor control module is used for judging whether the lock control motor module is opened or closed by output;
the lock control motor module is used for controlling the opening or closing of the intelligent door lock;
the electromagnetic pulse induction module is used for inducing strong electromagnetic pulses around the intelligent door lock and generating electromagnetic induction current;
a discharge circuit for discharging the sensed current to ground;
the isolation circuit is used for isolating the protection circuit from the system circuit and avoiding the breakdown of electronic components on the system circuit by electromagnetic energy; and
and the switch circuit is used for closing the protected port when the system circuit is subjected to strong electromagnetic interference so as to protect the system circuit from being damaged.
Referring to fig. 3, the anti-electromagnetic interference protection device that this application provided proposes the design of an anti strong electromagnetic pulse protection circuit, and protection circuit's effect is that when system circuit suffered strong electromagnetic interference, will sense power supply unit and system circuit and keep apart, discharges to ground to sensing the electric current simultaneously, and then protects system circuit's normal work, prevents that electronic components on the system circuit from being punctured by induced voltage, prevents that intelligent door lock motor control module from being restarted by resetting.
The protection circuit is connected between the protected port of the system circuit and the ground, and normally corresponds to an open circuit. When the system circuit suffers strong electromagnetic interference, the system circuit can couple higher voltage and larger current, and the protection circuit can provide a low-impedance channel to the ground for the large current, so that the influence of transient overvoltage and overcurrent on the system circuit and electrical components on the system circuit is inhibited, and the function of resisting electromagnetic pulse protection circuit is achieved.
The anti-electromagnetic pulse protection circuit comprises an induction antenna, a bleeder circuit D1, an isolation circuit U1, and switch circuits Q1 and Q2, and the detailed connection is shown in FIG. 4. When the system normally works, the optocoupler U1 is closed, the grid of the Q1 is pulled up to a high level through the R1, the Q1 is opened, the grid of the Q2 is connected to the ground, the Q2 is opened, and the system power supply is electrified. When electromagnetic pulse interference exists, the antenna can sense that the energy of the electromagnetic pulse is discharged to the ground through the D1, and meanwhile, the U1 optical coupler is driven to be opened. When U1 is turned on, the gate of Q1 is pulled to ground and Q1 is turned off, at which time the gate of Q2 is pulled high by R2 and Q2 is turned off. The system power is turned off.
Through anti strong electromagnetic pulse protection circuit (promptly, anti-electromagnetic interference protection device), when system circuit suffered strong electromagnetic interference, will sense the power supply part and keep apart with system circuit, discharge to ground to sensing the electric current simultaneously, prevent that electronic components on the system circuit from being punctureed by induced voltage, the partial system power that closes of switch circuit simultaneously, further protects electronic components on the system circuit and is punctureed by induced voltage to prevent lockhole motor module maloperation.
Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:
1. the larger electromagnetic induction current is discharged to the grounding end through the discharge circuit, so that the influence of transient overvoltage and overcurrent on a system circuit and electronic components on the system circuit of the intelligent door lock is inhibited, and the function of an electromagnetic pulse resistant protection circuit is achieved. The anti-electromagnetic interference protection device is isolated from the system circuit through the isolation circuit so as to prevent electronic components in the system circuit from being broken down, and the switch circuit disconnects the system power supply from the motor control module and the lock control motor module under the control of the isolation circuit so as to protect the system circuit of the intelligent door lock.
2. One diode or a plurality of parallel diodes provide a low-impedance discharge path to the grounding terminal for large current, and the plurality of parallel diodes can meet the requirement that high-power current discharges to the grounding terminal.
3. The anti-electromagnetic interference protection device can be isolated from the system circuit through the optical coupler or the relay, and the influence of high-power current in the discharge circuit on the switch circuit is avoided.
4. The switch circuit is controlled through the optical coupler or the relay, so that a system power supply, the motor control module and the lock control motor module can be timely disconnected through the switch circuit to protect a system circuit of the intelligent door lock when the system is subjected to strong electromagnetic interference; when the system is not interfered by strong electromagnetic interference, the switch circuit is normally conducted to enable the system circuit to normally work.
The utility model discloses do not relate to any software aspect's improvement. The utility model discloses only need with each device that has corresponding function pass through the utility model discloses the connection relation that gives connect can, wherein do not relate to the improvement in the aspect of any program software. The connection mode between the hardware devices with the corresponding functions is realized by the prior art by those skilled in the art, and is not described in detail herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (11)
1. An anti-electromagnetic interference protection device, comprising:
the electromagnetic pulse induction module is arranged in the shell of the protected equipment and used for inducing electromagnetic induction current when a system circuit of the protected equipment is subjected to electromagnetic interference, wherein the system circuit comprises a motor control module and a system power supply;
the discharge circuit is electrically connected between the electromagnetic pulse induction module and a grounding end;
the isolation circuit is connected with the discharge circuit and the switch circuit and controls the switch circuit to disconnect the system power supply from the motor control module; and
a switch circuit connected with the isolation circuit and connected at a protected port between the system power supply and the motor control module.
2. The protection device against electromagnetic interference of claim 1, wherein the electromagnetic pulse induction module comprises an antenna, wherein the antenna is configured to convert the electromagnetic interference signal into the electromagnetic induction current.
3. The EMI protection apparatus of claim 1 or 2, wherein said discharge circuit comprises a diode or a plurality of diodes connected in parallel, wherein,
the anodes of the one or more diodes are connected with an antenna in the electromagnetic pulse induction module; and
the cathodes of the one or more diodes are connected to ground.
4. The EMI protection apparatus as claimed in claim 3, wherein the number of said diodes is determined in accordance with the power of said EMI.
5. The anti-electromagnetic interference protection device of claim 3, further comprising a filter, wherein,
one end of the filter is connected to the antenna; and
the other end of the filter is connected to the anode of the one or more diodes.
6. The EMI protection device of claim 3, wherein the isolation circuit is an optocoupler including a light emitting diode and a phototransistor packaged together, wherein,
the anode of the light emitting diode is connected with the anode of the one or more diodes;
the cathode of the light emitting diode is connected with the cathode of the one or more diodes; and
and the collector of the phototriode is connected with the switch circuit, and the emitter of the phototriode is connected with the grounding terminal.
7. The EMI protection apparatus of claim 6 wherein the switch circuit includes an NMOS switch, a PMOS switch, a first resistor, and a second resistor, wherein,
the grid electrode of the NMOS switch is respectively connected with the collector electrode of the phototriode and the first end of the first resistor;
the source electrode of the NMOS switch is connected with the grounding end;
the drain electrode of the NMOS switch is respectively connected with the grid electrode of the PMOS switch and the first end of the second resistor;
a source of the PMOS switch connected to the second end of the first resistor, the second end of the second resistor, and the system power supply, respectively; and
and the drain electrode of the PMOS switch is connected with the motor control module.
8. The EMI protection apparatus of claim 3 wherein said isolation circuit includes a reverse loop diode, a rectifier diode and a relay, wherein,
one terminal of the coil of the relay is connected with the cathode of the rectifier diode;
the other terminal of the coil of the relay and the anode of the reverse loop diode are connected with the grounding terminal;
anodes of the rectifier diodes are respectively connected with anodes of the one or more diodes and cathodes of the reverse loop diodes;
the first wiring end of the normally open contact of the relay is connected with the switch circuit; and
and the second terminal of the normally open contact of the relay is connected with the grounding terminal.
9. The EMI protection apparatus of claim 8 wherein the switch circuit includes an NMOS switch, a PMOS switch, a first resistor, and a second resistor, wherein,
the grid electrode of the NMOS switch is respectively connected with a first terminal of a normally open contact of the relay and a first end of the first resistor;
the source electrode of the NMOS switch is connected with the grounding end;
the drain electrode of the NMOS switch is respectively connected with the grid electrode of the PMOS switch and the first end of the second resistor;
a source of the PMOS switch connected to the second end of the first resistor, the second end of the second resistor, and the system power supply, respectively; and
and the drain electrode of the PMOS switch is connected with the motor control module.
10. An intelligent lock, characterized in that it comprises an anti-electromagnetic interference protection device according to any one of claims 1 to 9.
11. The smart lock of claim 10 further comprising a system circuit coupled to the anti-emi protection device;
the system circuit comprises a motor control module, a lock control motor module and a system power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023113518.6U CN214255704U (en) | 2020-12-22 | 2020-12-22 | Anti-electromagnetic interference protection device and intelligent lock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023113518.6U CN214255704U (en) | 2020-12-22 | 2020-12-22 | Anti-electromagnetic interference protection device and intelligent lock |
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| CN214255704U true CN214255704U (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653111A (en) * | 2020-12-22 | 2021-04-13 | 北京华大智宝电子系统有限公司 | Anti-electromagnetic interference protection device and method |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653111A (en) * | 2020-12-22 | 2021-04-13 | 北京华大智宝电子系统有限公司 | Anti-electromagnetic interference protection device and method |
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