CN111082408A - Uninterrupted power supply surge protection system and protection method applied to industrial equipment - Google Patents

Abstract

The invention discloses an uninterruptible power supply surge protection system and method applied to industrial equipment, and the system comprises an input module, a power supply monitoring module, a relay module and a display module, wherein the input module is used for an input power supply of the industrial equipment, the power supply monitoring module is based on an HT7038 three-phase electric quantity meter intelligent electric meter chip and is used for acquiring current power supply state information in real time through the input module, analyzing and processing the current power supply state information, transmitting the processed power supply state information to the display module, the relay module acquires a control signal from the power supply monitoring module, outputs the control signal to be connected with the industrial equipment, and ensures the operation safety of the industrial equipment, and the display module is connected with the power supply monitoring module through the industrial equipment and is used for displaying the current power supply state information, setting power supply limiting information and inquiring related data. The HT7038 three-phase electric meter intelligent electric meter chip is used as a hardware platform, and the HT7038 three-phase electric meter intelligent electric meter has the advantages of high reaction speed, no follow current and long service life.

Description

Uninterrupted power supply surge protection system and protection method applied to industrial equipment

Technical Field

The invention relates to the technical field of power supply design, in particular to an uninterruptible power supply surge protection system and protection method applied to industrial equipment.

Background

Electronic systems and network lines are often interfered by external instantaneous overvoltage, and these interference sources mainly include: operating overvoltage due to on-off inductive load or on-off high-power load, line fault and the like; lightning surge due to natural phenomena such as lightning. Such an overvoltage (or overcurrent) is called a surge voltage (or a surge current), and is a kind of transient disturbance. Surge voltages can seriously jeopardize the safe operation of an electronic system. Eliminating surge noise interference and preventing surge damage are always the core problems related to safe and reliable operation of electronic equipment.

In order to avoid damaging the electronic equipment by the surge voltage, a shunt defense measure is generally adopted, namely the surge voltage is in short circuit with the ground within a very short time, so that the surge voltage flows into the ground, the purpose of weakening and eliminating the overvoltage and the overcurrent is achieved, and the effect of protecting the safe operation of the electronic equipment is achieved.

However, the conventional surge protection system has many defects, the switching elements (ceramic discharge tube BG, gas discharge tube GDT, semiconductor discharge tube TSS) have slow response speed (200-. Fig. 1 shows a general safety protection circuit.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides an uninterruptible power supply surge protection system applied to industrial equipment, which can solve the problems that in the surge protection system, switching elements have follow current, voltage limiting elements have larger capacitance, are easy to age and have shorter service life, and overcurrent and overheating prevention elements have too low reaction speed.

The technical scheme is as follows: on one hand, the uninterrupted power supply surge protection system applied to the industrial equipment comprises an input module, a power supply monitoring module, a relay module and a display module, wherein the input module is used for providing input power supply for the industrial equipment, the power supply monitoring module comprises a current monitoring module, a voltage monitoring module and an HT7038 three-phase electric meter intelligent electric meter chip, the current monitoring module is used for collecting real-time current of the industrial equipment, the voltage monitoring module is used for collecting real-time voltage of the industrial equipment, the HT7038 three-phase electric meter intelligent electric meter chip is used for acquiring the current and voltage values in real time through the current monitoring module and the voltage monitoring module, relevant information is transmitted to the relay module or the display module after the current and voltage values are analyzed and processed, the relay module acquires a control signal from the power supply monitoring module, outputs the control signal to be connected with the industrial equipment, and ensures the, the display module is connected with the power supply monitoring module through industrial equipment and is used for displaying current power supply state information, setting power supply limiting information and inquiring related data.

Further, comprising:

the power monitoring module is realized by an HT7038 three-phase electric quantity meter intelligent electric meter chip, a judging unit, an analyzing unit and a storage unit are arranged in the power monitoring module, the judging unit is used for judging whether industrial equipment is over-current or over-voltage in real time, if the over-current and the over-voltage are normal ranges, relevant information is sent to the analyzing unit, and if not:

if the current power supply information state is any or all of overcurrent and overvoltage, relevant information is sent to the relay module, and the relay module sends a control command;

the storage unit is used for storing power supply information in real time, setting real-time power supply state information sent by the display module and then transmitting the real-time power supply state information to the display module;

after the judging unit judges that the relevant information is in the normal range, the analyzing unit acquires the real-time current or/and voltage data information of the current equipment, resets the levels of overcurrent and overvoltage, and obtains the effective current, voltage, electric quantity and power.

Further, comprising:

the level of the overcurrent is divided into an alarm level and a control level according to the magnitude of the current value, the level of the overvoltage is divided into an alarm level and a control level according to the magnitude of the voltage value, and the judging unit judges the level range of the acquired external data and executes the corresponding level function.

Further, comprising:

if the judging unit judges that the range of the over-current and/or the over-voltage is the alarm level, the range is transmitted to a display module and alarm information is prompted, otherwise, if the range is the control level, the related data is transmitted to a controller module and processed.

Further, comprising:

the relay module comprises a first relay and a second relay, the input end of the first relay is connected with the HT7038 three-phase electric meter intelligent electric meter chip, the output end of the first relay is connected with industrial equipment, the first relay is in normally closed conduction under a normal state, when the control level of overcurrent and/or overvoltage occurs, the first relay is disconnected from the industrial equipment to achieve the blocking effect, the input end of the second relay is connected with the HT7038 three-phase electric meter intelligent electric meter chip, the output of the second relay is connected with the ground, the second relay is disconnected under the normal state, when the control level of overcurrent and/or overvoltage occurs, the second relay is connected with the industrial equipment to achieve the shunting effect.

Further, comprising:

the current monitoring module is realized by the current monitoring circuit who connects on industrial equipment, current monitoring circuit includes that input L is parallelly connected current-limiting resistance R3 and resistance R16 all the way, and ground connection behind the parallelly connected filter capacitor C4 in both ends of two resistances, voltage between the collection resistance R16 and then obtain corresponding electric current IAP, another way input N of current monitoring circuit is parallelly connected resistance R17 and resistance R4, and ground connection behind the parallelly connected filter capacitor C5 in both ends of two resistances, and voltage between the collection resistance R17 and then obtain corresponding electric current IAN, and IAP and IAN correspond and connect filter capacitor C1 between the circuit.

Further, comprising:

the voltage monitoring module is realized by a voltage monitoring circuit, the voltage monitoring circuit comprises a plurality of voltage limiting resistors and sampling resistors which are connected in series, two ends of each sampling resistor are connected with a filter capacitor C30, and the voltage UP at two ends of each sampling resistor is acquired.

In another aspect, the present invention provides a protection method implemented by the above uninterruptible power supply surge protection system applied to industrial equipment, where the method includes:

the method comprises the following steps that S1 a display module sets power supply limiting information, and an input module is connected with an input power supply of industrial equipment;

s2, the power supply monitoring module acquires the current power supply state information in real time through the input module, analyzes and processes the current power supply state information, and transmits the processed power supply state information to the display module;

s3, the relay module acquires a control signal from the power supply monitoring module, and adjusts the state of each relay according to the power supply state information to ensure the operation safety of the industrial equipment;

and the S4 display module displays the current power state information and manually inquires related data.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: 1. the HT7038 three-phase electric meter intelligent electric meter chip is used as a hardware platform, the method has the advantages of high reaction speed (ns level), no follow current and long service life, and the protection level can be set; 2. the serial port communication is realized based on the chip module, the current, the voltage, the power and the leakage current of a power supply network are monitored and transmitted to the power supply monitoring module in real time, and then the current, the voltage, the power and the leakage current are displayed by the industrial equipment terminal, so that a complete industrial equipment power supply condition monitoring system is established, the current industrial equipment power supply condition is fed back in real time, and the reliability and the stability of the industrial equipment are improved; 3. the system can observe the power supply condition of industrial equipment in real time, timely eliminate transient interference of surge voltage, overvoltage or overcurrent, realize uninterrupted power supply under external transient interference compared with the existing power supply circuit design, preset the voltage value and the current value, acquire, analyze, process and report the circuit power supply data, and inquire related data in real time.

Drawings

FIG. 1 is a schematic diagram of a safety protection circuit commonly used in the prior art;

FIG. 2 is a diagram of an uninterruptible power supply surge protection design system architecture of the present invention;

fig. 3 is a general block diagram of an ups surge protection design system of the present invention;

FIG. 4 is a general block diagram of modules of the surge protection design of the UPS of the present invention;

FIG. 5 is a schematic diagram of a relay control of the present invention;

FIG. 6 is a circuit diagram of a current monitoring module according to the present invention;

FIG. 7 is a circuit diagram of a voltage monitoring module according to the present invention.

Detailed Description

As shown in fig. 2-4, an uninterruptible power supply surge protection system applied to an industrial device includes an input module 1, a power monitoring module 2, a relay module 3, and a display module 4, where the input module 1 is used to provide an input power for the industrial device 100, the power monitoring module 2 includes a current monitoring module 21, a voltage monitoring module 22, and an HT7038 three-phase smart meter chip 23, the current monitoring module 21 is used to collect a real-time current of the industrial device, the voltage monitoring module is used to collect a real-time voltage of the industrial device, an output of the current monitoring module and an output of the voltage monitoring module are both connected to the HT7038 three-phase smart meter chip, the current monitoring module 21 is implemented by a current monitoring circuit connected to the industrial device, as shown in fig. 6, where P5 is a device connected by a circuit, the current monitoring circuit includes a current limiting resistor R3 and a current limiting resistor R16 connected in parallel at one input end L, the two ends of the two resistors are grounded after being connected with a filter capacitor C4 in parallel, the voltage between the resistors R16 is collected to obtain the corresponding current IAP, the other input end N of the current monitoring circuit is a resistor R17 and a resistor R4 which are connected in parallel, the two ends of the two resistors are grounded after being connected with the filter capacitor C5 in parallel, the voltage between the resistors R17 is collected to obtain the corresponding current IAN, and a filter capacitor C1 is connected between corresponding circuits of the IAP and the IAN.

The voltage monitoring module 22 is implemented by a voltage monitoring circuit, as shown in fig. 7, the voltage monitoring circuit includes a plurality of voltage limiting resistors and sampling resistors connected in series, two ends of the sampling resistor are connected to the filter capacitor C30, and voltage UP at two ends of the sampling resistor is collected.

HT7038 three-phase electric meter smart electric meter chip is used for acquireing current-voltage value in real time through current monitoring module and voltage monitoring module, to its analysis processes back, gives relay module or display module with relevant information transmission, relay module 3 follows power monitoring module 2 acquires control signal, and the output is connected with industrial equipment 100, ensures industrial equipment's operation safety, display module 4 links to each other with power monitoring module 2 through industrial equipment 100 for show current power state information, set up power and prescribe a limit to information and the relevant data of inquiry.

The intelligent electric meter chip of the HT7038 three-phase electric meter, the special high-performance three-phase electric energy measuring chip with multi-sensing HT7038/36 series and the circuits such as a high-precision second-order Sigma-delta ADC, a reference voltage circuit, digital signal processing and the like are integrated inside the intelligent electric meter chip, so that the active power, the reactive power, the apparent power, the active energy and the reactive energy of each phase and a combined phase can be measured, and parameters such as the effective value of each phase current and voltage, a power factor, a phase angle, frequency and the like can be measured. The series of chips provide an application solution with complete functions and simple design for three-phase multi-sensing measurement, and can fully meet the design requirements of a three-phase multi-rate multifunctional electric energy meter. The ATT7022E provides 7-path measurement ADC input, supports zero line measurement, can directly output all measurement parameters, supports gain and phase correction of a full digital domain, namely pure software meter calibration, and the peripheral MCU only needs to complete management and communication protocol programs required by the multifunctional electric energy meter. It provides active, reactive, apparent and fundamental wave metering functions, correspondingly provides CF1/CF2/CF3/CF4 pulse outputs, and can be directly connected to a standard table for error correction. Meanwhile, the ATT7022E can also provide synchronous ADC data of current and voltage, and harmonic analysis can be conveniently carried out. In addition, the device also provides a power quality detection SAG/Peak function and can be used for flicker analysis. HT7038/36 is a small package type ATT7022E, adopts LQFP32, provides 6 metering ADC inputs, and provides CF1/CF2 pulse outputs. HT7038 does not provide apparent, fundamental functionality, ADC synchronous data buffering and harmonic analysis.

The power monitoring module 2 is realized on the basis of an HT7038 three-phase electric meter intelligent electric meter chip, a judging unit 23, an analyzing unit 24 and a storage unit 25 are arranged in the chip, the judging unit is used for judging whether industrial equipment is over-current or over-voltage in real time, if the over-current and the over-voltage are normal ranges, relevant information is sent to the analyzing unit, and if not:

if the current power supply information state is any or all of overcurrent and overvoltage, the relevant information is sent to the relay module, the relay module sends a control command to the industrial equipment, and a corresponding control circuit is shown in fig. 5 and used for adjusting the input voltage to enable the input voltage to be in accordance with the smaller voltage of the industrial equipment;

the storage unit 25 is used for storing power supply information in real time, setting real-time power supply state information sent by the display module and then transmitting the real-time power supply state information to the display module;

after the determining unit 23 determines that the relevant information is in the normal range, the analyzing unit 23 obtains real-time current or/and voltage data information of the current device, resets the levels of overcurrent and overvoltage, and calculates to obtain corresponding effective current, voltage, electric quantity and power.

The level of the overcurrent is divided into an alarm level and a control level according to the magnitude of the current value, the level of the overvoltage is divided into an alarm level and a control level according to the magnitude of the voltage value, and the judging unit judges the level range of the acquired external data and executes the corresponding level function.

If the determining unit 23 determines that the range of the overcurrent and/or the overvoltage is the alarm level, the range is transmitted to the display module and the alarm information is prompted, otherwise, if the range is the control level, the related data is transmitted to the controller module and corresponding processing is performed. The level is set by a software program, for example, the overvoltage protection level is set to be a plurality of levels such as 250V, 300V and the like, whether external data exceeds a certain level set value is judged, corresponding level functions are executed, for example, an alarm level exceeding 250V but not exceeding 300V is displayed, alarm information is prompted, and if the control level exceeds 300V, the relay 1 is closed, and the relay 2 is opened to be connected with the ground. When the voltage and current of the power supply are reduced to a reasonable interval, the corresponding relay is restored to a normal working mode, and the normal working is restored in a very short time (the pull-in and off time of the relay is generally about 10 ms), so that the uninterrupted power supply effect is achieved.

The relay module 3 comprises a first relay 31 and a second relay 32, one end of the first relay 31 and one end of the second relay 32 are respectively connected with the power input module 1, the output of the first relay 31 is connected with the industrial equipment 100, normally closed conduction is realized at ordinary times, and once abnormal phenomena such as overcurrent, overvoltage or overload occur, the first relay 31 disconnects the industrial equipment from the input power supply, so that the blocking effect is achieved. The output of the second relay 32 is connected with the ground and normally opened, once overcurrent and overvoltage occur, the second relay 32 is connected with the ground and industrial equipment in a conducting mode, and therefore the shunting effect is achieved.

The display module 4 is connected with the power supply monitoring module 2, comprises a touch display screen, can perform setting modification and other operations, is also used for displaying current power supply state information and setting power supply overcurrent, overvoltage and other limiting information; and related data can be inquired in real time, the functions of remote networking monitoring, extraction, separation, estimation, evaluation reporting, decision making and the like of the equipment operation condition characteristics are realized, and the early warning function of the equipment is supported.

In another aspect, the present invention further provides a protection method implemented by the above uninterruptible power supply surge protection system applied to industrial equipment, where the method includes:

the method comprises the following steps that S1 a display module sets power supply limiting information, and an input module is connected with an input power supply of industrial equipment;

s2, the power supply monitoring module acquires the current power supply state information in real time through the input module, analyzes and processes the current power supply state information, and transmits the processed power supply state information to the display module;

s3, the relay module acquires a control signal from the power supply monitoring module, and adjusts the state of each relay according to the power supply state information to ensure the operation safety of the industrial equipment;

and the S4 display module displays the current power state information and manually inquires related data.

The invention realizes timely elimination of transient interference of surge voltage, overvoltage or overcurrent, adjusts the lightning protection grade of the module by presetting the voltage value and the current value, acquires, analyzes, processes and reports the circuit power supply data, can inquire related data in real time, has the functions of remote networking monitoring, extraction, separation, estimation, evaluation and reporting of equipment power supply condition characteristics, supports the early warning function of the equipment, and further improves the reliability and stability of industrial equipment.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. The utility model provides an uninterrupted power source surge protection system for industrial equipment, its characterized in that, this system includes input module, power monitoring module, relay module and display module, input module is used for providing input power for industrial equipment, power monitoring module includes current monitoring module, voltage monitoring module and HT7038 three-phase electric meter smart electric meter chip, current monitoring module is used for gathering industrial equipment's real-time current, voltage monitoring module is used for gathering industrial equipment's real-time voltage, HT7038 three-phase electric meter smart electric meter chip is used for acquireing current voltage value through current monitoring module and voltage monitoring module in real time, to its analysis processes back, transmits relevant information for relay module or display module, relay module follows power monitoring module acquires control signal, the output is connected with industrial equipment, the display module is connected with the power supply monitoring module through the industrial equipment and is used for displaying current power supply state information, setting power supply limiting information and inquiring related data.

2. The uninterruptible power supply surge protection system applied to industrial equipment according to claim 1, wherein a determination unit, an analysis unit and a storage unit are arranged in the HT7038 three-phase electric meter smart meter chip, the determination unit is configured to determine whether the industrial equipment is over-current or over-voltage in real time, if the over-current and the over-voltage are both normal ranges, relevant information is sent to the analysis unit, otherwise:

if the current power supply information state is any or all of overcurrent and overvoltage, relevant information is sent to the relay module, and the relay module sends a control command;

the storage unit is used for storing power supply information in real time, setting real-time power supply state information sent by the display module and then transmitting the real-time power supply state information to the display module;

after the judging unit judges that the relevant information is in the normal range, the analyzing unit acquires the real-time current or/and voltage data information of the current equipment, resets the levels of overcurrent and overvoltage, and obtains the effective current, voltage, electric quantity and power.

3. The system of claim 2, wherein the level of the overcurrent is classified into an alarm level and a control level according to the magnitude of the current value, the level of the overvoltage is classified into an alarm level and a control level according to the magnitude of the voltage value, and the determination unit determines the level range of the collected external data and performs a function corresponding to the level.

4. The system of claim 3, wherein if the determining unit determines that the over-current and/or over-voltage range is an alarm level, the over-current and/or over-voltage range is transmitted to a display module and prompts an alarm message, otherwise, if the over-current and/or over-voltage range is a control level, the relevant data is transmitted to a controller module and processed.

5. The uninterruptible power supply surge protection system applied to industrial equipment according to claim 3, wherein the relay module comprises a first relay and a second relay, the input end of the first relay is connected with the HT7038 three-phase electric meter smart electric meter chip, the output end of the first relay is connected with the industrial equipment, the first relay is normally closed and conducted in a normal state, when the control level of overcurrent and/or overvoltage occurs, the first relay is disconnected from the industrial equipment to achieve a blocking effect, the input end of the second relay is connected with the HT7038 three-phase electric meter smart electric meter chip, the output of the second relay is connected with the ground, the second relay is disconnected in a normal state, when the control level of overcurrent and/or overvoltage occurs, the second relay is connected with the ground and the industrial equipment to achieve a shunting effect.

6. The system of claim 1, wherein the current monitoring module is implemented by a current monitoring circuit connected to the industrial equipment, the current monitoring circuit includes a current limiting resistor R3 and a resistor R16 connected in parallel at one input end L, a filter capacitor C4 connected in parallel at two ends of the two resistors is grounded, a voltage between the resistors R16 is collected to obtain a corresponding current IAP, another input end N of the current monitoring circuit is a resistor R17 and a resistor R4 connected in parallel at another input end N, a filter capacitor C5 connected in parallel at two ends of the two resistors is grounded, a voltage between the resistors R17 is collected to obtain a corresponding current IAN, and a filter capacitor C1 is connected between corresponding lines of the IAP and the IAN.

7. The system of claim 1, wherein the voltage monitoring module is implemented by a voltage monitoring circuit, the voltage monitoring circuit comprises a plurality of voltage limiting resistors and sampling resistors connected in series, and a filter capacitor C30 is connected across the sampling resistors to collect the voltage UP across the sampling resistors.

8. A protection method implemented by the uninterruptible power supply surge protection system applied to industrial equipment according to any one of claims 1 to 7, characterized by comprising:

the method comprises the following steps that S1 a display module sets power supply limiting information, and an input module is connected with an input power supply of industrial equipment;

s2, the power supply monitoring module acquires the current power supply state information in real time through the input module, analyzes and processes the current power supply state information, and transmits the processed power supply state information to the display module;

s3, the relay module acquires a control signal from the power supply monitoring module, and adjusts the state of each relay according to the power supply state information to ensure the operation safety of the industrial equipment;

and the S4 display module displays the current power state information and manually inquires related data.

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