WO2020238090A1

WO2020238090A1 - Dc power supply smart integrated monitoring instrument

Info

Publication number: WO2020238090A1
Application number: PCT/CN2019/120488
Authority: WO
Inventors: 成大鹏; 吴芳玲; 孙云忠
Original assignee: 苏州迅鹏仪器仪表有限公司
Priority date: 2019-05-31
Filing date: 2019-11-25
Publication date: 2020-12-03
Also published as: CN110161430A

Abstract

Provided is a DC power supply smart integrated monitoring instrument, comprising a signal acquisition circuit, a central processing unit, a human-computer interface, and a storage unit. The signal acquisition circuit is connected to the DC power supply, and the signal acquisition circuit is used for collecting in real time the voltage data and current data of the DC power supply; the central processing unit is connected to the signal acquisition circuit, the central processing unit is used for calculating power data on the basis of the voltage data and current data and determining whether the data is abnormal, and outputting an alarm signal if the data is abnormal; the human-computer interface is connected to the central processing unit and used for cyclically displaying voltage data, electric current data, and power level data; the storage unit is connected to the central processing unit, and the storage unit is used for storing voltage data, electric current data, and power level data. The integrated monitoring instrument has comprehensive functions, strong intelligence, and a high degree of integration, enriches the functions of the instrument, enhances the scalability of an entire power management system, and reduces the cost of integrated monitoring and management of a DC power supply.

Description

Intelligent integrated monitoring instrument for DC power supply

Technical field

The invention belongs to the technical field of DC power monitoring, and specifically relates to an intelligent comprehensive monitoring instrument for DC power.

Background technique

With the widespread use of DC power supplies in power, industry, transportation, telecommunications and other industries, the monitoring requirements for DC power supplies during use and operation are becoming higher and higher; the normality of DC power supplies directly affects the power system and electrical equipment In order to ensure the reliable and stable operation of the DC power supply, the operation process of the DC power supply must be monitored in real time.

The functions of the current commonly used DC power monitoring instruments are relatively simple. To achieve full monitoring of current, voltage, power, abnormal alarm of measurement data, integrated monitoring of multiple monitoring instruments, etc., they can only be implemented separately by multiple modules. Use DC ammeter, DC voltmeter, DC electricity meter, relay and other module combination applications, as shown in Figure 1 (Note: 1. Figure 1 is a schematic diagram of a traditional DC power monitoring solution, and each detection instrument in the figure can be pointer indication Or digital display type; 2. When the meter detects current and voltage, if the signal is greater than the measuring range of the meter, an external shunt or voltage divider is required before entering the measuring meter). Such traditional solutions have problems such as few functions, poor performance, low intelligence, and high cost, and are increasingly unable to meet the market's demand for comprehensive monitoring of DC power supplies.

Summary of the invention

The purpose of the present invention is to provide a multi-function, high degree of intelligence, and low cost DC power intelligent integrated monitoring instrument.

In order to achieve the above objective, the technical solution adopted by the present invention is:

An intelligent integrated monitoring instrument for DC power supply is used to monitor DC power supply. The intelligent integrated monitoring instrument for DC power supply includes:

A signal acquisition circuit, the signal acquisition circuit is connected to the direct current power supply, and the signal acquisition circuit is used for real-time acquisition of voltage data and current data of the direct current power supply;

A central processing unit, the central processing unit is connected to the signal acquisition circuit, the central processing unit is used to calculate power data based on the voltage data and the current data, determine whether the data is abnormal, and output an alarm when the data is abnormal signal;

A man-machine interface, the man-machine interface is connected to the central processing unit and used to cyclically display the voltage data, the current data, and the power data;

A storage unit, the storage unit is connected to the central processing unit, and the storage unit is used to store the voltage data, the current data, and the power data.

The DC power supply intelligent integrated monitoring instrument also includes a clock circuit that provides a time reference signal for the central processing unit.

The DC power supply intelligent integrated monitoring instrument also includes an alarm device for alarming, and an alarm output circuit connected to the central processing unit, and the alarm output circuit is used for driving the alarm device based on the alarm signal output The drive signal.

The alarm device includes an alarm relay and/or an alarm indicator.

The DC power supply intelligent integrated monitoring instrument also includes a communication circuit for communicating with the DC power supply and the upper computer.

The communication circuit communicates with the host computer through a photoelectrically isolated RS485 interface.

The signal acquisition circuit includes a sampling module, a filtering module, a voltage dividing and amplifying module, an isolation module and an A/D conversion module connected in sequence.

The man-machine interface includes operation keys and a display screen.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: the present invention has comprehensive functions, strong intelligence, and high integration, thus enriching the functions of the instrument, enhancing the scalability of the entire power management system, and reducing The cost of integrated monitoring and management of DC power supply.

Description of the drawings

Figure 1 is a block diagram of a traditional DC power supply monitoring.

Figure 2 is a schematic block diagram of the intelligent integrated monitoring instrument for DC power supply of the present invention.

Figure 3 is a block diagram of a typical application system of the DC power intelligent integrated monitoring instrument of the present invention.

Fig. 4 is a flow chart of alarm work in the intelligent integrated monitoring instrument for DC power supply of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the embodiments shown in the drawings.

Embodiment 1: As shown in Figure 2 and Figure 3, an intelligent integrated monitoring instrument for DC power supply includes a signal acquisition circuit, a central processing unit, a human-machine interface, a storage unit, a clock circuit, an alarm output circuit, an alarm device, Communication circuit.

The signal acquisition circuit is connected with the DC power supply and is used to collect the voltage data and current data of the DC power supply in real time. The signal acquisition circuit includes a sampling module, a filter module, a voltage divider amplifying module, an isolation module and an A/D conversion module connected in sequence.

The central processing unit is connected with the signal acquisition circuit, and is used for calculating electric quantity data based on voltage data and current data, judging whether the data is abnormal and outputting an alarm signal when the data is abnormal.

The man-machine interface is connected with the central processing unit and is used to display voltage data, current data and power data cyclically.

The clock circuit is connected with the central processing unit and is used to provide a time reference signal for the central processing unit.

The alarm output circuit is connected with the central processing unit and is used for outputting a driving signal based on the alarm signal.

The alarm device is connected with the alarm output circuit and is used for alarming under the drive of the driving signal. The alarm device includes an alarm relay and/or an alarm indicator. The alarm relay can be connected to the sound and light alarm or the backstage of the power monitoring system. The alarm indicator can be integrated on the man-machine interface. The man-machine interface includes operating buttons and LED display.

The communication circuit is connected with the central processing unit for communication with the DC power supply and the upper computer. The communication circuit communicates with the upper computer through the optically isolated RS485 interface.

The signal acquisition circuit samples the DC power and DC current signals connected to the input terminals of the instrument, after filtering, voltage division/amplification, isolation, and A/D conversion, it enters the CPU for calculation.

The central processing unit (CPU) is the core of the entire instrument. After receiving the collected signals from the signal acquisition circuit, the data is sent to the storage unit for storage after calculation and processing, and the data is output to the man-machine interface for LED display. The central processing unit also The alarm logic control program needs to be processed. When the alarm conditions are met, it controls the action of the alarm output circuit and drives the alarm indicator of the man-machine interface; the CPU also needs to receive the communication data instruction and parse it, and return the corresponding data instruction according to the protocol content to realize the instrument Communication interaction with the host computer. In the central processing unit, the real-time operating voltage and current data of the DC power supply are simultaneously sampled, and the real-time power value is calculated. The DC power value is calculated through the integration of power or current and time, and the power can be measured for forward and reverse separately. Therefore, the charge and discharge process of the battery can be detected on the same instrument.

The storage unit stores various real-time measurement data, instrument system programs, instrument setting parameters, etc. The electrical energy values and instrument parameter values require data to be retained after power failure.

The clock circuit provides an accurate and stable time reference for program execution, logic control and energy value measurement.

The communication circuit realizes the connection between the instrument and the host computer of the DC power management system through the optically isolated RS485 interface; the instrument communication protocol complies with the Modbus-RTU standard protocol, and the host computer can collect real-time measurement values or instrument setting parameter values from the instrument.

The man-machine interface includes the measurement data display window, that is, the LED digital tube cyclically displays the measurement values, alarm indicators, and operation buttons. Measurement data display window: It can switch or cycle to display the measured values of forward energy, reverse energy, voltage, current, and power. Indicator lights: respectively, alarm indicator 1, alarm indicator 2, communication status, and power unit indicator. Data/parameter name display window: PH means forward energy, -PH means reverse energy, U means voltage, I means current, and P means power. Buttons: used to set parameters (such as alarm parameters, communication parameters), clear positive/reverse energy values, manually switch the measured value display and other operations.

The alarm output circuit receives CPU drive instructions, and when the detected data is abnormal, it drives the alarm relay to act. As shown in Figure 4, taking the current alarm function as an example, after the meter measures the DC current value, if the measured current value does not reach the alarm set value ALE1, the timers 1 and 2 are cleared, and the alarm relay is reset. The alarm indicator goes off. When the measured current value reaches the alarm value ALE1, the delay starts, and the timer 1 counts. When the delay time reaches the first alarm delay time AL_t, the alarm relay is activated and the alarm indicator light is on. When the current value reaches 1.25 of the alarm value ALE1 After doubling, the delay starts and timer 2 counts. After the delay time reaches the second alarm delay time AH_t, the alarm relay will act and the alarm indicator will light up. After any one of the above two alarm delays reaches the corresponding alarm delay time, the relay will act immediately, and the other delay will stop timing. The recovery condition after the relay action is: the current value drops below the alarm set value ALE1, and the alarm relay recovers immediately without delay.

The power circuit can isolate and convert the externally connected working voltage to provide the required voltage levels for other functional units of the instrument.

In the above scheme, when sampling current and voltage, if the signal is greater than the range of the signal acquisition circuit, the external current shunt or sensor, voltage sensor can be externally connected to the measuring instrument; the instrument can set the external device transformation ratio parameters to make the instrument follow The one-time actual value display is more intuitive.

The above scheme realizes the simultaneous measurement and calculation of multiple electric quantities, abnormal alarm judgment output, human-machine interface display, and communication interface output function integration with the same instrument, which greatly improves the integration of the instrument, enriches the functions of the instrument, and enhances the entire power management The scalability of the system reduces the cost of integrated monitoring and management of the DC power supply.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with the technology to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

An intelligent integrated monitoring instrument for DC power supply, used for monitoring DC power, is characterized in that: the intelligent integrated monitoring instrument for DC power supply includes:

A signal acquisition circuit, the signal acquisition circuit is connected to the DC power supply, the signal acquisition circuit is used to collect voltage data and current data of the DC power supply in real time, and the signal acquisition circuit includes a sampling module and a filter connected in sequence Module, voltage divider amplifier module, isolation module and A/D conversion module;

A central processing unit, the central processing unit is connected to the signal acquisition circuit, the central processing unit is used to calculate power data based on the voltage data and the current data, determine whether the data is abnormal, and output an alarm when the data is abnormal signal;

A man-machine interface, the man-machine interface is connected to the central processing unit and is used to cyclically display the voltage data, the current data, and the power data, the man-machine interface includes operation keys and a display screen;

A storage unit, the storage unit is connected to the central processing unit, and the storage unit is used to store the voltage data, the current data, and the power data;

A clock circuit, which provides a time reference signal for the central processing unit;

An alarm output circuit, the alarm output circuit is connected to the central processing unit, and is configured to output a driving signal based on the alarm signal;

An alarm device, which is connected to the alarm output circuit and is used for alarming under the drive of a driving signal. The alarm device includes an alarm relay and/or an alarm indicator, and the alarm relay is connected to a sound and light alarm or The power monitoring system is connected to the background, and the alarm indicator is integrated on the man-machine interface;

The communication circuit is used to communicate with the DC power supply and the upper computer, and the communication circuit communicates with the upper computer through an optically isolated RS485 interface.
An intelligent integrated monitoring instrument for DC power supply, used for monitoring DC power, is characterized in that: the intelligent integrated monitoring instrument for DC power supply includes:

A signal acquisition circuit, the signal acquisition circuit is connected to the direct current power supply, and the signal acquisition circuit is used for real-time acquisition of voltage data and current data of the direct current power supply;

A central processing unit, the central processing unit is connected to the signal acquisition circuit, the central processing unit is used to calculate power data based on the voltage data and the current data, determine whether the data is abnormal, and output an alarm when the data is abnormal signal;

A man-machine interface, the man-machine interface is connected to the central processing unit and used to cyclically display the voltage data, the current data, and the power data;

A storage unit, the storage unit is connected to the central processing unit, and the storage unit is used to store the voltage data, the current data, and the power data.
The intelligent integrated monitoring instrument for DC power supply according to claim 2, wherein the intelligent integrated monitoring instrument for DC power supply further comprises a clock circuit that provides a time reference signal for the central processing unit.
The intelligent integrated monitoring instrument for DC power supply according to claim 2, characterized in that: the intelligent integrated monitoring instrument for DC power supply further comprises an alarm device for alarming, an alarm output circuit connected to the central processing unit, and The alarm output circuit is used for outputting a driving signal for driving the alarm device based on the alarm signal.
The intelligent integrated monitoring instrument for DC power supply according to claim 4, wherein the alarm device includes an alarm relay and/or an alarm indicator.
The intelligent integrated monitoring instrument for DC power supply according to claim 2, characterized in that: the intelligent integrated monitoring instrument for DC power supply further comprises a communication circuit for communicating with the DC power supply and an upper computer.
The intelligent integrated monitoring instrument for DC power supply according to claim 6, wherein the communication circuit communicates with the host computer through a photoelectrically isolated RS485 interface.
The intelligent integrated monitoring instrument for DC power supply according to claim 2, wherein the signal acquisition circuit includes a sampling module, a filter module, a voltage divider amplification module, an isolation module, and an A/D conversion module connected in sequence.
The intelligent integrated monitoring instrument for DC power supply according to claim 2, wherein the man-machine interface includes operation keys and a display screen.