CN214154017U - Digital display type intelligent security monitoring power supply - Google Patents
Digital display type intelligent security monitoring power supply Download PDFInfo
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- CN214154017U CN214154017U CN202023284093.5U CN202023284093U CN214154017U CN 214154017 U CN214154017 U CN 214154017U CN 202023284093 U CN202023284093 U CN 202023284093U CN 214154017 U CN214154017 U CN 214154017U
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Abstract
The utility model discloses a digital display type intelligent security monitoring power supply, including 32 high-performance microcontroller units and respectively with 32H bridge drive control circuit units, electric energy metering circuit unit, LDO power module unit of high-performance microcontroller unit connection, electric energy metering circuit unit is connected with the mutual-inductor unit, LDO power module unit is connected with DC12V switch power circuit unit, H bridge drive control circuit unit is connected with AC voltage-stabilizing inverter circuit unit and DC12V switch power circuit unit respectively; the lightning protection circuit also comprises an interface unit, a lightning protection and protection unit and a relay unit which are connected in sequence, wherein the relay unit is respectively connected with the mutual inductor unit, the alternating current voltage stabilization inverter circuit unit, the DC12V switch power supply circuit unit and the H-bridge drive control circuit unit. The utility model has the advantages that: adopt power input/output interface integration lightning protection design, inside adopts the isolation measurement mode, and equipment integrated level is high.
Description
Technical Field
The utility model belongs to the technical field of the technique of power and specifically relates to a digital display intelligent security control power.
Background
At present, the camera power supply commonly used in China mainly comprises three modes, namely an alternating current-direct current adapter, a ring transformer and a switching power supply. The advantages of the devices are low cost, and the defects are that real-time remote monitoring and maintenance management cannot be realized, and the lightning protection function needs to be additionally provided with a lightning protection protector and reclosing equipment, so that the field wiring is complicated and difficult to maintain, and particularly, the voltage range required by the camera cannot be reached in places with large mains supply fluctuation, so that the camera and the holder work abnormally, and even die or are damaged. In the two current situations, a maintenance unit needs to consume a large amount of manpower and material resources to carry out routing inspection, and the timeliness of management is still difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a digital display type intelligent security monitoring power supply according to the defects of the prior art, which adopts the integrated lightning protection design of the power input and output interface, adopts the isolation measurement mode inside, has the functions of commercial power lightning protection, voltage, current, power, leakage detection and overcurrent, short circuit and leakage protection, also has the functions of AC24V and DC12V voltage stabilization output, and has the functions of automatic reclosing of the commercial power input end and the function of being provided with a lithium battery as an emergency auxiliary power supply of the system; the remote monitoring and control system has an RS485 communication interface, a light supplement lamp control interface, an Ethernet and wireless 4G communication function, can be directly connected with a system management platform, and has remote monitoring, control and local automatic control logic.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
the utility model provides a digital display intelligent security monitoring power which characterized in that: the high-performance low-voltage direct current converter comprises a 32-bit high-performance microcontroller unit, and an H-bridge drive control circuit unit, an electric energy metering circuit unit and an LDO power supply module unit which are respectively connected with the 32-bit high-performance microcontroller unit, wherein the electric energy metering circuit unit is connected with a mutual inductor unit, the LDO power supply module unit is connected with a DC12V switch power supply circuit unit, and the H-bridge drive control circuit unit is respectively connected with an alternating current voltage-stabilizing inverter circuit unit and the DC12V switch power supply circuit unit; the lightning protection circuit further comprises an interface unit, a lightning protection and protection unit and a relay unit which are sequentially connected, wherein the relay unit is respectively connected with the mutual inductor unit, the alternating current voltage-stabilizing inverter circuit unit, the DC12V switching power supply circuit unit and the H-bridge drive control circuit unit.
The lightning protection device comprises an interface unit and a relay unit, wherein the interface unit comprises a mains supply 220V input interface, a mains supply 220V output interface, an alternating current 24V output interface and a direct current 12V output interface, the lightning protection unit comprises a mains supply input lightning protection circuit, a mains supply output lightning protection circuit, an alternating current 24V lightning protection circuit and a direct current 12V lightning protection circuit, and the relay unit comprises an AC220V high-power relay, an AC24V high-power relay and a DC12V high-power relay; the commercial power 220V input interface is connected with the commercial power input lightning protection circuit, the commercial power input lightning protection circuit is connected with the AC220V high-power relay, the AC220V high-power relay is respectively connected with the mutual inductor unit, the H-bridge drive control circuit unit, the alternating current voltage stabilization inverter circuit unit, the DC12V switch power supply circuit unit and the commercial power output lightning protection circuit, and the commercial power output lightning protection circuit is connected with the commercial power 220V output interface; the AC24V high-power relay is respectively connected with the AC voltage-stabilizing inverter circuit unit, the H-bridge drive control circuit unit and the AC24V lightning protection circuit, and the AC24V lightning protection circuit is connected with the AC24V output interface; the DC12V high-power relay is respectively connected with the DC12V switching power supply circuit unit, the H-bridge drive control circuit unit and the DC12V lightning protection circuit, and the DC12V lightning protection circuit is connected with the DC12V output interface.
The 32-bit high-performance microcontroller unit is respectively connected with the RTC hardware clock unit, the LED state indicating unit, the buzzer unit, the temperature and humidity detection unit, the test switch unit, the OLED liquid crystal display and key setting unit, the RS485 communication unit, the light supplement lamp brightness adjustment control unit, the Ethernet ETH communication module unit and the wireless 4G communication module unit.
The RTC hardware clock unit comprises a clock chip and a clock crystal oscillator circuit; the LED state indicating unit comprises an operation indicating lamp, a communication indicating lamp and an alarm indicating lamp; the buzzer unit comprises a buzzer and a driving circuit; the temperature and humidity detection unit comprises a digital temperature sensor and a digital humidity sensor; the test switch unit comprises a light touch key switch and a system electric leakage simulation circuit; the OLED liquid crystal display and key setting unit comprises OLED liquid crystal, a liquid crystal driving circuit and inquiry, setting, addition and subtraction keys; the RS485 communication unit comprises an isolation circuit and a communication chip; the light supplement lamp brightness adjusting control unit comprises a light supplement lamp isolation communication circuit; the Ethernet ETH communication module unit comprises an isolation transformer and an Ethernet PHY chip; the wireless 4G communication module unit comprises a 4G module and a control circuit.
The 32-bit high-performance microcontroller unit comprises a 32-bit MCU, a reset circuit and a crystal oscillator circuit; the H-bridge drive control circuit unit comprises a relay drive circuit and a control circuit of an inverter and a switching power supply; the electric energy metering circuit unit comprises a metering chip and a control circuit; the transformer unit comprises a voltage transformer, a current transformer and a zero sequence transformer; the alternating current voltage stabilizing inverter circuit unit comprises a rectifying step-down and inverting circuit; the DC12V switching power supply circuit unit comprises a high-frequency transformer, a switching power supply chip and a protection circuit; the LDO power supply module comprises a reverse connection protection circuit, a power supply chip and a filter capacitor.
The utility model has the advantages that: the integrated lightning protection design of the power input and output interface is adopted, an isolation measurement mode is adopted inside the integrated lightning protection system, the integrated equipment level is high, the integrated lightning protection system has the functions of commercial power lightning protection, voltage, current, power, leakage detection, overcurrent, short circuit and leakage protection, and has the function of automatic reclosing of a commercial power input end and a lithium battery serving as an emergency auxiliary power supply of the system; the remote control system has the advantages that the remote control system has the RS485 communication interface, the light supplement lamp control interface and the Ethernet and wireless 4G communication function, can be directly butted with a system management platform, has remote control and local automatic control logic, is simple and convenient for new construction or old-recycling transformation, can greatly reduce the construction difficulty and labor cost for carrying out later-stage maintenance work of equipment in a large number, and is suitable for large-scale popularization and application in the field of video monitoring.
Drawings
Fig. 1 is the utility model discloses the work flow chart of digital display intelligent security control power.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:
as shown in FIG. 1, the numerals 1-20 in the figure are respectively shown as a 32-bit high-performance microcontroller unit 1, an RTC hardware clock unit 2, an LED status indication unit 3, a buzzer unit 4, a temperature and humidity detection unit 5, a test switch unit 6, an OLED liquid crystal display and key setting unit 7, an RS485 communication unit 8, a fill-in lamp brightness adjustment control unit 9, an Ethernet ETH communication module unit 10, a wireless 4G communication module unit 11, an H-bridge drive control circuit unit 12, an electric energy metering circuit unit 13, an LDO power module unit 14, a transformer unit 15, a voltage transformer 15-1, a current transformer 15-2, a zero sequence transformer 15-3, a DC12V switch power circuit unit 16, an AC voltage stabilization inverter circuit unit 17, an interface unit 18, a commercial power 220V input interface 18-1 and a commercial power 220V output interface 18-2, the lightning protection circuit comprises an alternating current 24V output interface 18-3, a direct current 12V output interface 18-4, a lightning protection unit 19, a mains input lightning protection circuit 19-1, a mains output lightning protection circuit 19-2, an alternating current 24V lightning protection circuit 19-3, a direct current 12V lightning protection circuit 19-4, a circuit relay unit 20, an AC220V high-power relay 20-1, an AC24V high-power relay 20-2 and a DC12V high-power relay 20-3.
Example (b): as shown in fig. 1, the present embodiment relates to a digital display type intelligent security monitoring power supply, which mainly includes a 32-bit high-performance microcontroller unit 1, and an RTC hardware clock unit 2, an LED status indication unit 3, a buzzer unit 4, a temperature and humidity detection unit 5, a test switch unit 6, an OLED liquid crystal display and key setting unit 7, an RS485 communication unit 8, a fill lamp brightness adjustment control unit 9, an ethernet ETH communication module unit 10, a wireless 4G communication module unit 11, an H-bridge drive control circuit unit 12, an electric energy metering circuit unit 13, and an LDO power supply module unit 14, wherein the electric energy metering circuit unit 13 is connected to a transformer unit 15, the LDO power supply module unit 14 is connected to a DC12V switch power supply circuit unit 16, the H-bridge drive control circuit unit 12 is connected to an ac voltage stabilization inverter circuit unit 17 and a DC12V switch power supply circuit unit 16, the lightning protection circuit also comprises an interface unit 18, a lightning protection unit 19 and a relay unit 20 which are connected in sequence, wherein the relay unit 20 is respectively connected with the mutual inductor unit 15, the alternating current voltage-stabilizing inverter circuit unit 17, the DC12V switching power supply circuit unit 16 and the H-bridge drive control circuit unit 12.
As shown in fig. 1, the interface unit 18 includes a commercial power 220V input interface 18-1, a commercial power 220V output interface 18-2, an AC24V output interface 18-3, and a DC12V output interface 18-4, the lightning protection unit 19 includes a commercial power input lightning protection circuit 19-1, a commercial power output lightning protection circuit 19-2, an AC24V lightning protection circuit 19-3, and a DC12V lightning protection circuit 19-4, and the relay unit 20 includes an AC220V high power relay 20-1, an AC24V high power relay 20-2, and a DC12V high power relay 20-3. The commercial power 220V input interface 18-1 is connected with a commercial power input lightning protection circuit 19-1, the commercial power input lightning protection circuit 19-1 is connected with an AC220V high-power relay 20-1, the AC220V high-power relay 20-1 is respectively connected with a mutual inductor unit 15, an H bridge drive control circuit unit 12, an alternating current voltage-stabilizing inverter circuit unit 17, a DC12V switch power supply circuit unit 16 and a commercial power output lightning protection circuit 19-2, and the commercial power output lightning protection circuit 19-2 is connected with a commercial power 220V output interface 18-2; the AC24V high-power relay 20-2 is respectively connected with the AC voltage-stabilizing inverter circuit unit 17, the H-bridge drive control circuit unit 12 and the AC24V lightning protection circuit 19-3, and the AC24V lightning protection circuit 19-3 is connected with the AC24V output interface 18-3; the DC12V high-power relay 20-3 is respectively connected with the DC12V switching power supply circuit unit 16, the H bridge drive control circuit unit 12 and the direct current 12V lightning protection circuit 19-4, and the direct current 12V lightning protection circuit 19-4 is connected with the direct current 12V output interface 18-4.
As shown in fig. 1, the present embodiment further has the following working method:
(1) a mains supply 220V input power supply is connected to an AC220V high-power relay 20-1 through a mains supply input lightning protection circuit 19-1, then outputs a 3.3V power supply through a DC12V switching power supply circuit 16 and an LDO power supply module 14, and is connected to a 32-bit high-performance microcontroller unit 1 to provide a working power supply for each stage of circuits of the system.
(2) The commercial power 220V input power is connected to the electric energy metering circuit 13 through the commercial power input lightning protection unit 19, the relay unit 20, the voltage transformer 15-1, the current transformer 15-2 and the zero sequence transformer 15-3, and then connected to the 32-bit high-performance microcontroller unit 1, so that the functions of commercial power 220V voltage, current, power factor and leakage data acquisition are realized, and finally, the controllable output of the commercial power 220V with the protection function is completed through the H-bridge drive control circuit 12, the AC220V high-power relay 20-1, the commercial power output lightning protection unit 19-2 and the commercial power 220V output interface 18-2.
(3) The voltage transformer 15-1, the current transformer 15-2 and the zero sequence transformer 15-3 are sequentially connected to the electric energy metering circuit 13, the electric energy metering circuit 13 is connected to the 32-bit high-performance microcontroller unit 1, the voltage, the current, the power and the electric leakage data of the 220V mains supply are isolated and measured by the transformer unit 15, and under-voltage protection, electric leakage protection, over-current short-circuit protection and system linkage processing are carried out according to a set threshold value.
(4) The commercial power 220V input power supply realizes the voltage-stabilized output from the commercial power 220V to the alternating current 24V through the commercial power input lightning protection circuit 19-1, the relay unit 20 and the alternating current voltage-stabilized inverter circuit 17, and then realizes the controllable output with the protection function through the AC24V high-power relay 20-2, the alternating current 24V lightning protection circuit 19-3 and the alternating current 24V output interface 18-3.
(5) The mains supply 220V input power supply realizes the voltage-stabilized output from the mains supply 220V to the direct current 12V through the mains supply input lightning protection circuit 19-4, the relay unit 20 and the DC12V switching power supply circuit 16, and then realizes the controllable output with the protection function through the DC12V high-power relay 20-3, the direct current 12V lightning protection circuit 19-4 and the direct current 12V output interface 18-4.
(6) The 32-bit high-performance microcontroller unit 1 is connected to the relay unit 20 through the H-bridge drive control circuit 12, and when mains supply input overvoltage, undervoltage, output leakage, overload, overcurrent and short circuit are detected, the mains supply input and output are quickly cut off through the AC220V high-power relay 20-1, and an automatic reclosing function is started according to a strategy.
(7) The 32-bit high-performance microcontroller unit 1 is connected to the relay unit 20 through the H-bridge drive control circuit 12, and when the AC24V output short circuit is detected, the AC24V high-power relay 20-2 is disconnected, and the hiccup type output function is started; when a short circuit of the DC12V output is detected, the DC12V high power relay 20-3 is opened and the hiccup output function is started.
The 32-bit high-performance microcontroller unit 1 comprises a 32-bit MCU, a reset circuit and a crystal oscillator circuit, wherein the reset circuit is connected with an RST pin of the MCU, the crystal oscillator circuit is connected with OSC _ IN and OSC _ OUT pins of the MCU, and the three of the reset circuit and the OSC _ IN and OSC _ OUT pins form a minimum system; the RTC hardware clock unit 2 comprises a clock chip and a clock crystal oscillator circuit, is connected to an IIC1 pin of the 32-bit high-performance microcontroller unit 1, and provides an accurate date and time metering function for the system; the LED state indicating unit 3 comprises operation, communication and alarm indicating lamps, the three indicating lamps have different colors and are connected to GPIOA 1-3 pins of the 32-bit high-performance microcontroller unit 1 to realize the indicating function of the working state of the system; the buzzer unit 4 comprises a buzzer and a driving circuit, is connected to a GPIOA4 pin of the 32-bit high-performance microcontroller unit 1, and realizes the functions of system alarm and key feedback ringing; the temperature and humidity detection unit 5 comprises a digital temperature sensor and a digital humidity sensor, realizes the temperature and humidity detection function of the environment at the position of the equipment by connecting to the IIC2 of the 32-bit high-performance microcontroller unit 1, and can transmit the acquired environment data or the overrun alarm to the management platform through the Ethernet communication module 10 or the wireless 4G communication module 11; the test switch unit 6 comprises a light touch key switch and a system electric leakage simulation circuit, the test switch unit 6 is connected to a GPIOB0 pin of the 32-bit microcontroller 1 and the electric energy metering circuit unit 13 through an internal electric leakage simulation load circuit, and the functions of electric leakage simulation and reclosing protection mechanism verification are realized; the OLED liquid crystal display and key setting unit 7 comprises an OLED liquid crystal, a liquid crystal driving circuit and inquiry, setting, addition and subtraction keys, and is connected to an SPI1 pin of the 32-bit high-performance microcontroller unit 1, so that the functions of 220V voltage, current, power, leakage current, leakage frequency, environment temperature and humidity display, relay on-off state, system parameter and state inquiry and setting are realized; the RS485 communication unit 8 comprises an isolation circuit and a communication chip, and the RS485 communication unit 8 is connected to a UART1 pin of the 32-bit high-performance microcontroller unit 1 through the internal isolation circuit to realize the functions of local real-time monitoring and system configuration; the light supplement lamp brightness adjusting control unit 9 comprises a light supplement lamp and an isolation communication circuit, the light supplement lamp brightness adjusting control unit 9 is connected to a UART2 pin of the 32-bit high-performance microcontroller unit 1 through the isolation communication circuit, and the output brightness of the light supplement lamp is automatically adjusted according to the collected ambient light illumination and the set measurement; the Ethernet ETH communication module unit 10 comprises an isolation transformer and an Ethernet PHY chip, and the Ethernet ETH communication module unit 10 is accessed to the related pins of the MAC layer of the 32-bit high-performance microcontroller unit 1 through an Ethernet protocol stack and a network interface chip to realize the Ethernet communication function with the remote Internet of things platform; the wireless 4G communication module unit 11 comprises a 4G module and a control circuit, and the 4G module and the control circuit are directly connected to a UART3 pin of the 32-bit high-performance microcontroller unit 1 to realize a wireless communication function with a remote Internet of things platform; the H-bridge drive control circuit unit 12 comprises a relay drive circuit and a control circuit of an inverter and a switching power supply, and is matched with the 32-bit high-performance microcontroller unit 1 to realize the functions of commercial power input reclosing, multi-path power supply output and control; the electric energy metering circuit unit 13 comprises a metering chip and a control circuit, the mutual inductor unit 15 comprises a voltage mutual inductor 15-1, a current mutual inductor 15-2 and a zero sequence mutual inductor 15-3, and the electric energy metering circuit unit 13 is matched with the mutual inductor unit 15 to realize the isolation and collection functions of the voltage, the current and the leakage data of the mains supply; the alternating current voltage-stabilizing inverter circuit unit 17 comprises a rectification voltage-reducing and inverting circuit and is used for realizing the voltage-stabilizing output function from 220V of the mains supply to 24V of the alternating current; the DC12V switching power supply circuit unit 16 includes a high-frequency transformer, a switching power supply chip and a protection circuit, and is used for realizing the voltage stabilization output function from the mains supply to the direct current 12V; the LDO power supply module 14 includes a reverse connection protection circuit, a power supply chip, and a filter capacitor, and realizes a stable supply function of a system power supply.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.
Claims (5)
1. The utility model provides a digital display intelligent security monitoring power which characterized in that: the high-performance low-voltage direct current converter comprises a 32-bit high-performance microcontroller unit, and an H-bridge drive control circuit unit, an electric energy metering circuit unit and an LDO power supply module unit which are respectively connected with the 32-bit high-performance microcontroller unit, wherein the electric energy metering circuit unit is connected with a mutual inductor unit, the LDO power supply module unit is connected with a DC12V switch power supply circuit unit, and the H-bridge drive control circuit unit is respectively connected with an alternating current voltage-stabilizing inverter circuit unit and the DC12V switch power supply circuit unit; the transformer is characterized by further comprising an interface unit, a lightning protection unit and a relay unit which are sequentially connected, wherein the relay unit is respectively connected with the transformer unit, the alternating current voltage-stabilizing inverter circuit unit, the DC12V switching power supply circuit unit and the H-bridge drive control circuit unit.
2. The digital display intelligent security monitoring power supply of claim 1, wherein: the lightning protection device comprises an interface unit and a relay unit, wherein the interface unit comprises a mains supply 220V input interface, a mains supply 220V output interface, an alternating current 24V output interface and a direct current 12V output interface, the lightning protection unit comprises a mains supply input lightning protection circuit, a mains supply output lightning protection circuit, an alternating current 24V lightning protection circuit and a direct current 12V lightning protection circuit, and the relay unit comprises an AC220V high-power relay, an AC24V high-power relay and a DC12V high-power relay; the commercial power 220V input interface is connected with the commercial power input lightning protection circuit, the commercial power input lightning protection circuit is connected with the AC220V high-power relay, the AC220V high-power relay is respectively connected with the mutual inductor unit, the H-bridge drive control circuit unit, the alternating current voltage stabilization inverter circuit unit, the DC12V switch power supply circuit unit and the commercial power output lightning protection circuit, and the commercial power output lightning protection circuit is connected with the commercial power 220V output interface; the AC24V high-power relay is respectively connected with the AC voltage-stabilizing inverter circuit unit, the H-bridge drive control circuit unit and the AC24V lightning protection circuit, and the AC24V lightning protection circuit is connected with the AC24V output interface; the DC12V high-power relay is respectively connected with the DC12V switching power supply circuit unit, the H-bridge drive control circuit unit and the DC12V lightning protection circuit, and the DC12V lightning protection circuit is connected with the DC12V output interface.
3. The digital display intelligent security monitoring power supply of claim 1, wherein: the 32-bit high-performance microcontroller unit is respectively connected with the RTC hardware clock unit, the LED state indicating unit, the buzzer unit, the temperature and humidity detection unit, the test switch unit, the OLED liquid crystal display and key setting unit, the RS485 communication unit, the light supplement lamp brightness adjustment control unit, the Ethernet ETH communication module unit and the wireless 4G communication module unit.
4. The digital display intelligent security monitoring power supply of claim 3, wherein: the RTC hardware clock unit comprises a clock chip and a clock crystal oscillator circuit; the LED state indicating unit comprises an operation indicating lamp, a communication indicating lamp and an alarm indicating lamp; the buzzer unit comprises a buzzer and a driving circuit; the temperature and humidity detection unit comprises a digital temperature sensor and a digital humidity sensor; the test switch unit comprises a light touch key switch and a system electric leakage simulation circuit; the OLED liquid crystal display and key setting unit comprises OLED liquid crystal, a liquid crystal driving circuit and inquiry, setting, addition and subtraction keys; the RS485 communication unit comprises an isolation circuit and a communication chip; the light supplement lamp brightness adjusting control unit comprises a light supplement lamp isolation communication circuit; the Ethernet ETH communication module unit comprises an isolation transformer and an Ethernet PHY chip; the wireless 4G communication module unit comprises a 4G module and a control circuit.
5. The digital display intelligent security monitoring power supply of claim 1, wherein: the 32-bit high-performance microcontroller unit comprises a 32-bit MCU, a reset circuit and a crystal oscillator circuit; the H-bridge drive control circuit unit comprises a relay drive circuit and a control circuit of an inverter and a switching power supply; the electric energy metering circuit unit comprises a metering chip and a control circuit; the transformer unit comprises a voltage transformer, a current transformer and a zero sequence transformer; the alternating current voltage stabilizing inverter circuit unit comprises a rectifying step-down and inverting circuit; the DC12V switching power supply circuit unit comprises a high-frequency transformer, a switching power supply chip and a protection circuit; the LDO power supply module comprises a reverse connection protection circuit, a power supply chip and a filter capacitor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023284093.5U CN214154017U (en) | 2020-12-31 | 2020-12-31 | Digital display type intelligent security monitoring power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023284093.5U CN214154017U (en) | 2020-12-31 | 2020-12-31 | Digital display type intelligent security monitoring power supply |
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| CN214154017U true CN214154017U (en) | 2021-09-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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2020
- 2020-12-31 CN CN202023284093.5U patent/CN214154017U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
| CN116359603B (en) * | 2023-03-29 | 2023-10-24 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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