CN210690666U - Remote locking and alarming device for electric energy metering cabinet - Google Patents
Remote locking and alarming device for electric energy metering cabinet Download PDFInfo
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- CN210690666U CN210690666U CN201921519973.0U CN201921519973U CN210690666U CN 210690666 U CN210690666 U CN 210690666U CN 201921519973 U CN201921519973 U CN 201921519973U CN 210690666 U CN210690666 U CN 210690666U
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Abstract
The utility model relates to a long-range locking of electric energy measurement cabinet and alarm device wades in the electric power measurement production measurement cabinet remote control and opens and remote signalling alarm device technical field, including remote control signal anti-interference module, remote control unlocking logic module, remote signalling alarm logic module, audible-visual alarm module, anti-interference power module and adopt shielding metal casing, shielding paired line, the technique that the interference killing feature was strengthened to a bit ground. The utility model discloses the device is to input signal, door position switch, electromagnetic lock state switch adopt anti shake and anti high-voltage pulse design of unblanking around load control terminal, the measurement cabinet. The remote unlocking of the electromagnetic lock by the remote control contact of the load control terminal and illegal unlocking remote signaling alarm are realized. Still adopt audible and visual alarm protection to illegal opening, strengthen resisting novel high-pressure pulse violence unlocking capability, ensured power equipment safety and stability in the measurement cabinet, improve measurement safety control work level.
Description
Technical Field
The utility model relates to a long-range locking of electric energy measurement cabinet and alarm device relates to the door lock device of electric energy measurement cabinet, especially one kind can the remote control unblank, remote signaling is reported to the police to have the door lock device who prevents external force, anti electromagnetic pulse characteristic. The door lock device has the advantages that the door lock device can realize remote control unlocking and locking of a metering cabinet door lock, sound and light alarm for external force damage unlocking and remote signaling background alarm for the opening state of a cabinet door, and the electromagnetic pulse violent unlocking resistance characteristic is resisted by using a shielding protection principle; the door opening program of the cabinet door of the electric equipment such as the metering cabinet can be standardized, the controllable control of the opening of the cabinet door is strengthened, and illegal destructive behaviors such as illegal electricity stealing and the like can be prevented. The method is suitable for power production in various environments, and particularly for safe and reliable management of power utilization.
Background
The electric energy metering cabinet is internally provided with electric equipment such as an electric energy meter, a load terminal and the like, the equipment provides certificates and guarantees with user energy agreements for electric power enterprises, and in the process of daily operation and maintenance and electricity utilization inspection of the electric energy metering device by the electric power enterprises, the conditions that the seals and seals of a large number of electric energy metering boxes (cabinets) are damaged and lost are found. These damages make the metering cabinet door can be illegally opened at any time and accompany the safety problem of power equipment and the behavior of electricity stealing by lawless persons.
Therefore, the traditional measures such as mechanical lock, seal and the like of the metering cabinet are difficult to meet the safety management requirements of the existing metering cabinet. The electromagnetic lock has technical advantages in the aspect of remote control unlocking, but the pure local unlocking cannot realize the controllable control of the locking state of the metering cabinet, and faces the threat of electromagnetic pulse violent unlocking, the common electromagnetic lock does not have anti-interference design aiming at the electromagnetic pulse, and the false action is easily generated under the complex electromagnetic environment of power production.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a remote locking and alarming device of an electric energy metering cabinet aiming at the defects; the device is matched with the existing field-mounted load control terminal and is connected with the existing power load management system (hereinafter referred to as a load control system for short), a remote control unlocking signal is remotely sent to the load control terminal by a master station of the load control system, the load control terminal transmits the remote control signal to the device connected with the electromagnetic lock through the closing of a normally open contact, whether the alarm is given or not is judged by the device, and if the alarm is given, an audible and visual alarm is started and a load control remote signal is sent. Sound and light alarm and remote signaling alarm are given for illegal external force opening behavior; the electromagnetic pulse violent unlocking and illegal damage are avoided by adopting an electromagnetic shielding scheme with high magnetic conductivity and high electric conductivity and adopting power isolation and signal isolation methods.
The utility model discloses an adopt following technical scheme to realize:
a remote locking and alarming device of an electric energy metering cabinet is provided with a shell and a circuit board arranged in the shell, wherein the circuit board is provided with a remote control signal anti-interference module, a remote control unlocking logic module, a remote control alarming logic module, an audible and visual alarming module and an anti-interference power module;
the remote control signal anti-interference module, the remote control unlocking logic module, the remote control alarm logic module and the sound-light alarm module are sequentially connected; the anti-interference power supply module is respectively connected with the remote control signal anti-interference module, the remote control unlocking logic module, the remote control alarm logic module and the sound and light alarm module to provide working electric energy; the signal transmission lines adopted during the connection all adopt shielded twisted-pair lines.
The remote control signal anti-interference module is used for removing jitter, isolating and converting an authorization signal from a power load management system monitoring terminal, and then sending the processed authorization signal to the remote control unlocking logic module.
The remote control unlocking logic module is used for judging whether a remote control signal exists or not and driving the electromagnetic lock to act according to the remote control signal.
The remote signaling alarm logic module is used for judging whether the metering cabinet is normally locked, when the cabinet door is locked, the position switches of the front door and the rear door of the metering cabinet are enabled, if the cabinet door is illegally opened, the position switches of the front door and the rear door of the metering cabinet are triggered, whether the cabinet door is illegally opened can be judged through a trigger signal of the switch position, and then the negative control terminal is driven by an internal remote signaling alarm driving circuit to carry out remote signaling alarm.
The acousto-optic alarm module is used for giving out sound and flashing alarm, a 555 timer and an auxiliary circuit thereof are respectively adopted to form an oscillating circuit, when an acousto-optic alarm signal sent by the remote signaling alarm logic module is at a low level (no alarm), the circuit is always in a reset state, namely, counting is not carried out, so acousto-optic alarm is not carried out; when the acousto-optic alarm signal sent by the remote signaling alarm logic module is at a high level (alarm), the reset end is set high, the oscillation circuit is started to work, the LED lamp is driven to emit stroboflash, and the buzzer sounds.
The anti-interference power supply module adopts a cascading mode of an AC/DC switching power supply and a DC/DC isolation module, converts a power frequency power supply into a direct current and isolated stable power supply, and supplies the direct current and isolated stable power supply to the remote control signal anti-interference module, the remote control unlocking logic module, the remote control signal alarm module, the sound-light alarm module and the electromagnetic lock.
The shielding shell with high magnetic conductivity and high electric conductivity is an iron-nickel alloy shell coated with a layer of copper foil. The copper foil belongs to a high-conductivity material for electrostatic shielding, and the iron-nickel alloy is a high-permeability material for magnetic shielding. The shielded twisted-pair line is used for load control terminal, electromagnetic lock, front and back cabinet door state switch and alternating current power supply and the utility model discloses the connecting wire that is connected between the device. The shielding layer of the shielded twisted pair wire is provided with the shielding shell of the device of the utility model which is reliably connected. The shielding shell is reliably grounded at one point of the power connection point of the metering cabinet.
The electromagnetic lock adopts a commercially available electromagnetic lock, and is characterized by automatic power-off locking, high-level pulse unlocking and lock position feedback switch; when the high level pulse of unblanking, the electromagnetic lock is opened, and electromagnetic lock position switch disconnection simultaneously feeds back electromagnetic lock open mode, and when the cabinet door was closed, electromagnetic lock drive signal low level, electromagnetic lock locking, position state switch closure feedback electromagnetic lock closed condition.
The utility model discloses the device during operation:
1) the signal input end of the remote control signal anti-interference module is connected with a normally closed contact or a normally open contact of the load control terminal to be used as an input authorization signal; when the signal input end of the remote control signal anti-interference module is connected with the normally closed contact of the load control terminal, the selection switch of the remote control unlocking logic module is set to be at the normally closed contact position, and the selection switch is represented by low level logic, otherwise, the selection switch is set to be high level logic. After the load control terminal receives the remote control unlocking command, the normally open contact in the load control terminal is closed, the normally closed contact is closed, and an authorization signal in a high level form is sent to the remote control signal anti-interference module.
2) The authorization signal is input to the remote control unlocking logic module through the remote control signal anti-interference module.
3) And after receiving the authorization signal, the remote unlocking logic module drives the electromagnetic lock to unlock according to the remote control signal.
The remote signaling alarm logic module receives a remote control signal, a front door state switch, a rear door position state switch and an electromagnetic lock opening and closing state switch as input signals, wherein the front door state switch, the rear door position state switch and the electromagnetic lock opening and closing state switch are connected in series and then are connected into the remote signaling alarm logic module. When the front door state switch, the rear door position state switch and the electromagnetic lock switching state switch are all closed, normal locking of the metering cabinet is indicated, when any one of the switch states is opened, the metering cabinet is not locked, at the moment, the remote signaling alarm logic module outputs an alarm signal, the alarm signal is divided into two paths and respectively sent to the sound-light alarm module and the remote signaling alarm driving circuit, the remote signaling alarm driving circuit is composed of a relay and a triode, the alarm signal drives the relay to be conducted, the switch is closed, namely, a switch closing signal is sent to the load control terminal, remote signaling alarm is achieved, otherwise, the relay is not conducted, the switch is disconnected, and no alarm is given.
The utility model discloses overcome the not enough of traditional measurement cabinet mechanical lock, facing slip, seal, through cooperating with the load management system, realize that measurement cabinet remote control authorizes unblanking, illegally opens functions such as reputation and remote signalling warning.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
FIG. 2 is a schematic diagram of the structure of the remote control signal anti-interference module of the present invention;
fig. 3 is an electrical schematic diagram of the present invention for signal format conversion;
FIG. 4 is a schematic diagram of the structure of the remote unlocking logic module of the present invention;
fig. 5 is a schematic diagram of the structure of the remote signaling alarm logic module of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments, in which the circuit diagrams are merely examples and do not represent the only implementations.
Referring to the attached drawing 1, the utility model relates to a long-range locking of electric energy measurement cabinet and alarm device contains device itself, outside cabinet door state switch contact, electromagnetic lock and load control terminal's remote control contact, remote signaling input and mutually supports, accomplishes measurement cabinet door remote control and opens, and the remote signaling of non-blocking state is reported to the police, and on-the-spot acousto-optic warning energy supply. The utility model discloses the device is through adopting each part to take shielding twisted pair to connect, device itself installs and makes high magnetic conduction, high electrically conductive shielding shell in one with cladding copper foil iron-nickel alloy and realize anti high-pressure pulse violence characteristic of unblanking. The utility model discloses the device is inside to contain remote control signal anti-interference module, remote control unlocking logic module, remote control alarm logic module, remote signaling alarm logic module, anti-interference power module. The anti-interference power supply module adopts a cascading mode of an AC/DC switching power supply and a DC/DC isolation module, converts a power frequency power supply into a direct current and isolated stable power supply, and supplies the direct current and isolated stable power supply to the remote control signal anti-interference module, the remote control unlocking logic module, the remote control signal alarm module, the sound-light alarm module and the electromagnetic lock.
Referring to fig. 2, the remote control signal anti-interference module includes an interference signal suppression part and an interference signal isolation part, which are respectively used for processing the opening and closing signals of the remote control normally open contact and the remote control normally closed contact located at the load control terminal of the metering cabinet.
The interference signal suppression part comprises a normally closed node input circuit and a normally open node input circuit, and users can freely select the interference signal suppression part when the interference signal suppression part is used.
The normally-open node input circuit comprises an inductor L2, a resistor R1, a photoelectric coupler U1 and a resistor R4 which are sequentially connected in series, wherein the input end of the photoelectric coupler U1 is connected with the resistor R1, and the output end of the photoelectric coupler U1 is connected with the resistor R4 and is grounded; when the normally open node is in an open state, the light emitting diode in the photoelectric coupler U1 does not work, at the moment, the output end of the photoelectric coupler U1 is grounded through a resistor R4, and the output is in a low level state; a transient suppression diode TVS1, a resistor R8 and a capacitor C3 are connected in parallel between the rear end of the inductor L2 and the front end of the resistor R1 and the ground wire, the resistor R1 is a current-limiting resistor, the inductor L2 plays a role in signal filtering, the transient suppression diode TVS1 is used for absorbing spike pulse interference generated during switching action, the resistor R8 is matched with the resistor R1 for use, the resistance of a light-emitting diode driving circuit in the photocoupler U1 is increased, when a normally-open node is closed, the resistor R8 is short-circuited, the light-emitting diode in the photocoupler U1 is turned on, and the authorized signal output of the normally-open contact is changed into high level.
The normally closed node input circuit comprises an inductor L3, a resistor R3, a photoelectric coupler U2 and a resistor R5 which are sequentially connected in series, wherein the input end of the photoelectric coupler U2 is connected with the resistor R3, and the output end of the photoelectric coupler U2 is connected with the resistor R5 and is grounded; when the normally closed node is in a closed state, a light emitting diode in the photoelectric coupler U2 works, at the moment, the output end of the photoelectric coupler U2 is connected with a power supply VCC through a resistor R5, and the output is in a low level state; a transient suppression diode TVS2, a resistor R9 and a capacitor C4 are connected in parallel between the rear end of the inductor L3 and the front end of the resistor R3 and the ground, the resistor R3 is a current-limiting resistor, the inductor L3 plays a role in signal filtering, the transient suppression diode TVS2 is used for absorbing spike pulse interference generated during switching action, the resistor R9 is matched with the resistor R3 for use, the resistance of a light-emitting diode driving loop inside the photocoupler U2 is increased, when a normally-closed node is opened, the resistor R9 is enabled, the light-emitting diode inside the photocoupler U2 is extinguished, and the authorization signal output of the normally-closed contact is changed into high level.
In the elements of the two-part circuit (normally-open node input circuit and normally-closed node input circuit), the breakdown voltage of the transient suppression diode TVS1 and the transient suppression diode TVS2 of the interference signal suppression part is 8V, typical values of the inductance L2 and the inductance L3 are 100uH, typical values of the capacitance C3 and the capacitance C4 are 100nF, typical values of the resistance R8 and the resistance R9 are 500k Ω, and typical values of the resistance R1 and the resistance R3 are 100 Ω.
The interference signal isolation part adopts an isolation circuit, and the core part of the interference signal isolation part adopts an optical coupling element, which is typically PC 817A-C.
And remote control normally open contact and remote control normally closed contact opening and closing signals of the load control terminal are converted into level signals reflecting remote control opening and closing through the remote control signal anti-interference module.
Referring to fig. 3, the signal format shown in fig. 2 is converted, and a D flip-flop with a rising edge being inverted (a commercially available 74HC74 flip-flop is used in the embodiment of fig. 3) is used to convert an impulse type signal into a level type signal, so as to adapt to the switching of multiple signal formats of a negative control terminal, and the circuit of fig. 3 is a circuit for converting an impulse type signal into a level type signal and can be accessed as needed.
Referring to fig. 4, the remote unlocking logic module includes 2 input modes of a normally open contact authorization signal and a normally closed contact authorization signal, which can be selected by a user at will. At any moment, only one input is effective, and a logic OR circuit, a monostable trigger circuit and an unlocking driving circuit are cascaded behind the input. The logic or circuit is implemented using the integrated chip 74ls32, with any input means active high, and the logic or circuit output remote control unlock high. The monostable trigger is realized by an integrated circuit chip 74ls221, the monostable trigger is triggered to output a 500ms pulse signal when the remote control unlocking signal is at a high level, and an unlocking signal driving circuit consisting of an NPN triode, a relay and a pull-up resistor outputs 500ms driving voltage to drive the electromagnetic lock.
The working method of the remote control unlocking logic module is specifically as follows: when no remote control signal is input as shown in fig. 2, the normally open contact authorization signal and the normally closed contact authorization signal of the circuit are both output at low level. A user arbitrarily selects a certain input mode, and if a remote control normally open contact is used, when the contact is closed, the normally open contact authorizes a signal to set a high level logic; if a remote normally closed contact is used, the closed contact authorization signal is set to high level logic when the contact is opened. As shown in fig. 5, only one of the normally open contact authorization signal and the normally closed contact authorization signal is active at any time, i.e., is set to a level, and the authorization signal is output through a logic or circuit and is characterized by a high level. The high level signal triggers the monostable trigger to output 0.5s high level pulse, the pulse outputs unlocking pulse to the electromagnetic lock through the drive circuit formed by the triode and the relay, and the high level signal is sent to the remote signaling alarm logic module.
Referring to fig. 5, the remote signaling alarm module is composed of a front door and rear door state judgment circuit, a signal blocking circuit in an authorized state, an alarm circuit and a remote signaling alarm driving circuit.
As shown in fig. 5, the status signals of the front door and the rear door will implement logical or operation, that is, whichever door is opened the logical or circuit will output the status signal that the door is opened; in addition, the acousto-optic alarm signal is used as a control signal of a triode Q1 to drive a relay to act, so that the state signal output to a negative control remote communication channel is realized for remote alarm. When an alarm signal is available, the remote signaling alarm driving circuit drives the relay to be closed, and a switch closing signal (remote signaling alarm) is provided for the load control terminal.
As shown in fig. 5, the states of the front door and the rear door are provided by the photoelectric switches. The logic or circuit adopts a chip 74LS32, the inverter adopts an integrated circuit chip 74LS14 to realize the inversion of the remote control signal, and the logic and circuit adopts an integrated chip 74LS08 to realize. When the remote control unlocking operation is not available and the states of the front door, the rear door and the state are forcibly changed, the logic OR gate outputs an alarm high-level signal, no authorization signal exists at the moment, the AND gate is opened, and the alarm signal can pass through the AND gate. The state output circuit is composed of a typical value of 200 omega of protective resistance R11, a relay and an NPN type triode, the triode is conducted, the relay is closed, and when the alarm is not given, the triode is turned off, and the relay is turned off. And an opening and closing state quantity reflecting the state of the cabinet door is provided for the load control switch.
The sound and light alarm module adopts a 555 timer and auxiliary circuits thereof to respectively form an oscillation circuit, an LED and a buzzer. When the acousto-optic alarm signal sent by the remote signaling alarm logic module is at low level (no alarm), the circuit is always in a reset state, namely, counting is not carried out, so that acousto-optic alarm is not carried out. When the sound-light alarm signal sent by the remote signaling alarm logic module is at a high level (alarm), the reset end is high, the oscillating circuit is enabled, the LED lamp emits stroboflash, and the buzzer sounds.
Claims (7)
1. The utility model provides a long-range locking of electric energy measurement cabinet and alarm device which characterized in that: the remote control unlocking device is provided with a shell and a circuit board arranged in the shell, wherein the circuit board is provided with a remote control signal anti-interference module, a remote control unlocking logic module, a remote control alarm logic module, an acousto-optic alarm module and an anti-interference power module;
the remote control signal anti-interference module, the remote control unlocking logic module, the remote control alarm logic module and the sound-light alarm module are sequentially connected; the anti-interference power supply module is respectively connected with the remote control signal anti-interference module, the remote control unlocking logic module, the remote control alarm logic module and the sound and light alarm module to provide working electric energy; the signal transmission lines adopted during the connection all adopt shielded twisted-pair lines;
the remote control signal anti-interference module is used for removing jitter, isolating and converting an authorization signal from a monitoring terminal of the power load management system and then transmitting the authorization signal to the remote control unlocking logic module;
the remote control unlocking logic module is used for judging whether a remote control signal exists or not and driving the electromagnetic lock to act according to the remote control signal;
the remote signaling alarm logic module is used for judging whether the metering cabinet is normally locked or not and driving the load control terminal to carry out remote signaling alarm through an internal remote signaling alarm driving circuit;
the sound and light alarm module is used for giving out sound and flashing alarm;
the anti-interference power supply module adopts a cascading mode of an AC/DC switching power supply and a DC/DC isolation module, converts a power frequency power supply into a direct current and isolated stable power supply, and supplies the direct current and isolated stable power supply to the remote control signal anti-interference module, the remote control unlocking logic module, the remote control signal alarm module, the sound-light alarm module and the electromagnetic lock.
2. The remote locking and alarming device of the electric energy metering cabinet as claimed in claim 1, wherein: the sound and light alarm module adopts a 555 timer and auxiliary circuits thereof to respectively form an oscillation circuit.
3. The remote locking and alarming device of the electric energy metering cabinet as claimed in claim 1, wherein: the shell adopts a shielding shell with high magnetic conductivity and high electric conductivity, the circuit board and the shell adopt one-point grounding, and the shell and the grounding point of the metering cabinet adopt a short circuit of an electric wire.
4. The remote locking and alarming device of the electric energy metering cabinet as claimed in claim 3, wherein: the shielding shell with high magnetic conductivity and high electric conductivity is an iron-nickel alloy shell coated with a layer of copper foil.
5. The remote locking and alarming device of the electric energy metering cabinet as claimed in claim 1, wherein: the electromagnetic lock is capable of automatically locking when power is off and unlocking by high-level pulse, and is provided with an electromagnetic lock position feedback switch.
6. The remote locking and alarming device of the electric energy metering cabinet as claimed in claim 1, wherein: the remote control signal anti-interference module comprises an interference signal suppression part and an interference signal isolation part, and is respectively used for processing opening and closing signals of a remote control normally-open contact point and a remote control normally-closed contact point which are positioned at a load control terminal of the metering cabinet.
7. The remote locking and alarming device of the electric energy metering cabinet as claimed in claim 6, wherein: the interference signal suppression part comprises a normally open node input circuit and a normally closed node input circuit; the normally-open node input circuit comprises an inductor L2, a resistor R1, a photoelectric coupler U1 and a resistor R4, wherein the input end of the photoelectric coupler U1 is connected with the resistor R1, the output end of the photoelectric coupler U1 is connected with the resistor R4, and the other end of the R4 is grounded; when the normally open node is in an open state, the light emitting diode in the photoelectric coupler U1 does not work, at the moment, the output end of the photoelectric coupler U1 is grounded through a resistor R4, and the output is in a low level state; a transient suppression diode TVS1, a resistor R8 and a capacitor C3 are connected in parallel between the rear end of the inductor L2 and the front end of the resistor R1 and the ground wire, the resistor R1 is a current-limiting resistor, the inductor L2 plays a role in signal filtering, the transient suppression diode TVS1 is used for absorbing spike pulse interference generated during switching action, the resistor R8 is matched with the resistor R1 for use, the resistance of a light-emitting diode driving loop in the photocoupler U1 is increased, when a remote control normally-open node is closed, the resistor R8 is short-circuited, the light-emitting diode in the photocoupler U1 is turned on, and the normally-open contact authorized signal output is changed into high level;
the normally closed node input circuit comprises an inductor L3, a resistor R3, a photoelectric coupler U2 and a resistor R5, wherein the input end of the photoelectric coupler U2 is connected with the resistor R3, the output end of the photoelectric coupler U2 is connected with the resistor R5, and the other end of the R5 is grounded; when the remote control normally-closed node is in a closed state, a light emitting diode in the photoelectric coupler U2 works, at the moment, the output end of the photoelectric coupler U2 is connected with a power supply VCC through a resistor R5, and a normally-closed electric shock authorization signal is output in a low level state; a transient suppression diode TVS2, a resistor R9 and a capacitor C4 are connected in parallel between the rear end of the inductor L3 and the front end of the resistor R3 and the ground, the resistor R3 is a current-limiting resistor, the inductor L3 plays a role of signal filtering, the transient suppression diode TVS2 is used for absorbing spike pulse interference generated during switching, the resistor R9 is used in cooperation with the resistor R3 to increase the resistance of a light emitting diode driving circuit inside the photocoupler U2, when a normally-closed node is opened, the resistor R9 is released from a short-circuited state, the light emitting diode inside the photocoupler U2 is extinguished, and the normally-closed contact authorization signal output becomes a high level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921519973.0U CN210690666U (en) | 2019-09-12 | 2019-09-12 | Remote locking and alarming device for electric energy metering cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921519973.0U CN210690666U (en) | 2019-09-12 | 2019-09-12 | Remote locking and alarming device for electric energy metering cabinet |
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| CN210690666U true CN210690666U (en) | 2020-06-05 |
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| CN201921519973.0U Active CN210690666U (en) | 2019-09-12 | 2019-09-12 | Remote locking and alarming device for electric energy metering cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112012586A (en) * | 2020-09-04 | 2020-12-01 | 国网四川省电力公司成都供电公司 | Electromagnetic lock control system and method suitable for electric meter |
| WO2024045291A1 (en) * | 2022-09-01 | 2024-03-07 | 圣邦微电子（北京）股份有限公司 | One-shot circuit |
-
2019
- 2019-09-12 CN CN201921519973.0U patent/CN210690666U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112012586A (en) * | 2020-09-04 | 2020-12-01 | 国网四川省电力公司成都供电公司 | Electromagnetic lock control system and method suitable for electric meter |
| WO2024045291A1 (en) * | 2022-09-01 | 2024-03-07 | 圣邦微电子（北京）股份有限公司 | One-shot circuit |
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