CN2757310Y

CN2757310Y - Mixed power electronic breaker observe and control device

Info

Publication number: CN2757310Y
Application number: CN 200420078282
Authority: CN
Inventors: 郑建勇; 梅军; 秦申蓓; 丁祖军; 苏麟; 吴恒荣; 陈军
Original assignee: Jiangsu huaxia electric group; Southeast University
Current assignee: Jiangsu huaxia electric group; Southeast University
Priority date: 2004-08-03
Filing date: 2004-08-03
Publication date: 2006-02-08
Anticipated expiration: 2014-08-03

Abstract

The utility model relates to a measurement and control device for a mixed power electronic circuit breaker. A main control device is composed of a Hall voltage sensor, a Hall current sensor, an A/D sampling circuit, an alternating current zero-crossing detecting circuit, a digital signal processor, a programmable logic controller and an input/output switching value circuit; a voltage signal and a current signal is converted by the Hall voltage sensor and the Hall current sensor, then, the voltage signal and the current signal are output to the A/D sampling circuit, and the result of sampling operation is read by the digital signal processor; the programmable logic controller controls the digital signal processor and the A/D sampling circuit. A driving device is composed of a driving module and a programmable logic control module; the programmable logic control module outputs a driving signal to the driving module; the driving module outputs an overcurrent protection autolocking signal to the programmable logic control module, which outputs an overcurrent soft turn-off signal to the driving module, and the main control device outputs a control signal to the programmable logic control module of the driving device.

Description

Mixed Electric And Electronic Circuit Breaker Measuring And Control Device

Technical field

The utility model belongs to the power transmission and distribution apparatus field, relates to a kind of Mixed Electric And Electronic Circuit Breaker Measuring And Control Device.

Background technology

Developing rapidly of electric power system makes it face new problem and challenge, must will seek the technology that can significantly improve the circuit breaker responsiveness in order to be ready for the challenge.The foreign scholar has proposed a kind of new type hybrid power controller at present, it is on the basis of electromagnetic switch, utilize power electronic device in parallel with the contact of electromagnetic switch as non-contact switch, bear steady-state process by electromagnetic switch, and non-contact switch solves the dynamic process of switch, and both form mutual supplement with each other's advantages.And can realize can be fast accurately the AC signal of the main circuit of circuit breaker being realized collection and data processing in order can really effectively to realize just must will designing the control of such circuit breaker; judge the generation of fault timely; want simultaneously and can realize correct control the mechanical chopper and the power electronics static switch of hybrid circuit breaker, and the measure and control device of wanting to provide the power electronics static switch circuit breaker that drives and protect.

Summary of the invention

The utility model provides a kind of Mixed Electric And Electronic Circuit Breaker Measuring And Control Device that can shorten the circuit breaker break-time.

The utility model adopts following technical scheme:

A kind of Mixed Electric And Electronic Circuit Breaker Measuring And Control Device that belongs to power transmission and distribution equipment, form by master control set 1 and drive unit 2, it is characterized in that master control set is by the Hall voltage transducer, Hall current sensor, A/D sample circuit 11, AC signal zero crossing detection circuit 12, digital signal processor 13, be used to produce the programmable logic controller (PLC) 15 of control signal and open into the amount of leaving circuit and form, the voltage of main circuit, current signal is through Hall voltage, after the current sensor conversion, output is connected to the A/D sample circuit, after the A/D sampling, the result is placed on data wire reads by digital signal processor 13 chips; Programmable logic controller (PLC) 15 produces control signal and comes control figure signal processor 13 and A/D sample circuit 11, drive unit is made up of driver module 21 and universal logic module 22, and universal logic module 22 is transported to driver module 21 with drive signal; Driver module 21 is transported to universal logic module 22 with the over current protecting self-locking signal; universal logic module 22 is transported to driver module with the soft cut-off signals of overcurrent, and the control signal that master control set produces programmable logic controller (PLC) 15 is transported to the universal logic module 22 of drive unit.

Compared with prior art, the utlity model has following advantage:

(1) the utility model has utilized the powerful data-handling capacity of TMS320F240 chip; be equipped with A/D sampling A AD976A and Hall element at a high speed; can gather in real time and handle the AC signal in the hybrid electric power electronic circuit breaker main circuit; can shorten the switch off time of circuit breaker, the protection to circuit breaker can be provided simultaneously.

(2) the utility model is equipped with liquid crystal display easily and keyboard interface and communication module, though can realize friendly human interface function and data exchanging function, realize the communication between this device and the host computer easily.

(3) the EXB841 drive circuit after the utility model adopt to improve drives time that can shorten the protection blind area, improves starting to control a little of overcurrent protection IGBT, can realize more reliable, stable driving.

(4) the utility model adopts CPLD construction logic control circuit, because the erasable property of CPLD makes the adjustment of control logic become very flexible, does not need its hardware circuit is redesigned.It is that main element constitutes digitized over current protecting self-locking circuit that this device adopts with CPLD and active crystal oscillator.Because the time-delay of CPLD is generally in nanosecond, the frequency of active crystal oscillator is also very stable, so can design the point-device over current protecting self-locking circuit of time-delay.

Description of drawings

Fig. 1 is the block diagram of Mixed Electric And Electronic Circuit Breaker Measuring And Control Device.This device mainly is divided into two parts: measure and control device master control set and measure and control device drive unit.

Fig. 2, Fig. 3 are the electrical schematic diagrams of voltage, current sensor and A/D sample circuit.

Fig. 4 is the electrical schematic diagram of AC signal zero crossing detection circuit.

Fig. 5 is the electrical schematic diagram of the control circuit of digital signal processor.

Fig. 6 is the electrical schematic diagram of memory expansion circuit.

Fig. 7 is the electrical schematic diagram of CPLD control signal circuit.

Fig. 8 is the schematic diagram of the functional module of CPLD inside.

Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14, Figure 15 be respectively control logic schematic diagram, the data acquisition and control module of control logic schematic diagram, the keyboard signal of control logic schematic diagram, the house dog of control logic schematic diagram, the liquid crystal control module of data memory module the control logic schematic diagram, open the control logic schematic diagram into the amount of leaving signal, the control logic schematic diagram of waiting signal.

Figure 16 is the electrical schematic diagram of opening into amount, the amount of leaving circuit.

Figure 17, Figure 18 are respectively the electrical schematic diagrams of man-machine interface and communicating circuit.

Figure 19 is the electrical schematic diagram of drive unit EXB841 drive circuit.

Figure 20 is a drive unit CPLD Logic control module electrical schematic diagram.

Figure 21 is a drive unit CPLD Logic control module internal logic schematic diagram.

Specific embodiment

A kind of Mixed Electric And Electronic Circuit Breaker Measuring And Control Device that belongs to power transmission and distribution equipment, form by master control set 1 and drive unit 2, it is characterized in that master control set is by the Hall voltage transducer, Hall current sensor, A/D sample circuit 11, AC signal zero crossing detection circuit 12, digital signal processor 13, be used to produce the programmable logic controller (PLC) 15 of control signal and open into the amount of leaving circuit and form, the voltage of main circuit, current signal is through Hall voltage, after the current sensor conversion, output is connected to the A/D sample circuit, after the A/D sampling, the result is placed on data wire reads by digital signal processor 13; Programmable logic controller (PLC) 15 produces control signal and comes control figure signal processor 13 and A/D sample circuit 11, drive unit is made up of driver module 21 and universal logic module 22, and universal logic module 22 is transported to driver module 21 with drive signal; Driver module 21 is transported to universal logic module 22 with the over current protecting self-locking signal; universal logic module 22 is transported to driver module with the soft cut-off signals of overcurrent; the control signal that master control set produces programmable logic controller (PLC) 15 is transported to the universal logic module 22 of drive unit

In the present embodiment,

Voltage sensor adopts VSM500D Hall voltage transducer, current sensor adopts the HNC050LA Hall current sensor, A/D sample circuit 11 is that the sampling A of AD976A and multichannel that model is AD7506 select chip to form by model, be connected to 1 pin as 28 pin of the AD7506 of output as the AD976A of input, digital signal processor 13 adopts the TMS320F240 chip, the Hall voltage transducer, the measuring junction of Hall current sensor, receive resistance successively, the input of the low-pass filter circuit of electric capacity, signal AN1～AN12 after the low-pass filtering and reference voltage signal ANT_-6 and ANT_+6 are connected to the input of AD7506, A0～A3 of AD7506 is connected to the 63rd of

digital signal processor

13,65,66,100 pin, 16 position datawires of AD976 are connected on the data wire of digital signal processor 13 simultaneously, and 26 pin of AD976 are connected to 36 pin of CPLD; Above-mentioned programmable logic controller (PLC) 15 is made up of XC95108 chip and online programming mouth JTAG, and wherein the

22,38,64,64,78 of XC95108 connects+the 5V power supply;

8,27,42,60 ground connection;

28,29,30,59 respectively as the TDI of online programming mouth JTAG, TMS, TCK and TDO end, and between power supply and ground, connect the 0.1uF leaded multilayer ceramic capacitor and the 10uF electrochemical capacitor comes uncoupling, XC95108 pin of

chip

1,2,3,4,5,6,7,9 receive the data wire D0～D7 of digital signal processor 13, XC95108 pin of

chip

10,11,12,14,15 meet display module LCD respectively, LCDRD, LCDWE, LCDC/D, the LCDRST pin, pin 13 connects the CLKOUT pin of digital signal processor 13,

17,18,19,20,21,23,24,25 meet the A8 of digital signal processor 13 respectively, A9, A10, A11, A12, A13, A14, the A15 pin, pin 26 connects the DS pin of digital signal processor 13,

31,32,33,34,35 meet the IS of digital signal processor 13 respectively, W/R, READY pin 36 connects the AD976 pin of A/D sample circuit 11,

37,39 connect the WE and the R/C pin of digital signal processor 13 respectively,

43,44,45,46,47,48,50,51,52,53,54,55,56,57,58,61,62,63,65,66,67 are connected to respectively and open into leaving module KI1～KI12 and DL1～DL8 pin,

70,71,72,74 meet 6 of reset circuit X5043 respectively, 2,5,1 pin,

76,77,79,80,81,82,83,84 connect the KEY7～KEY0 pin of keyboard; Be connected with man-machine interface circuit and communicating circuit on the JP1 end of digital signal processor 13, the man-machine interface circuit is made up of LCD MODULE and indicator light, it provides the Interface Terminal JP1 with LCD MODULE T6963C, and the signal that master board offers this terminal has: 8 bit data bus D0～D7; Reset signal LCDRST; Read-write control signal WR, RD; Director data channel selecting signal A0; The chip selection signal LCD of liquid crystal control (annotate: these signals are partly provided by CPLD), supply power voltage+5V and GND, and the negative pressure Vo that is used for LCD backlight control provide the Interface Terminal JP_CPU1 that gets in touch with the control signal of motherboard simultaneously.Its signal that provides is controlled the signal L1～L7 of LED light light on and off in addition, and running mark lamp LED1～7 of device are normal in order to display unit, reports to the police action, states such as electric power thus supplied, the RS232 serial ports J1 that the verifying unit of adjusting needs.Communicating circuit is made of MAX232 and MAX485, the TXD that the SCI mouth of digital signal processor 13 sends, RXD becomes standard traffic level via MAX232 with the MAX485 level conversion with the DE signal, decide the signal of communication output of device by jumper switch SW1 is any in these two kinds of agreements actually, and this module provides the CAN bus interface that is made of CAN controller MCP2510 and CAN driver 82c250 simultaneously; On the data wire of digital signal processor 13, be connected with memory expansion circuit 14, memory expansion circuit 14 is made up of two static data memory CY7c1021-15vc and non-volatile data storage DS1644 chip, 16 bit address lines of this circuit, 16 position datawires, pin WE, pin W/R, pin PS and digital signal processor 13 respective pin A0～A15, D0～D15, WE, W/R, PS pin are connected, pin 1644, pin DAR_CS link to each other with 34,35 pin of CPLD respectively; It is the chip for driving of EXB841 that above-mentioned driver module 21 is selected model for use, and 1 pin that is connected with insulated gate bipolar transistor IGBT and chip for driving on chip for driving meets the emitter-base bandgap grading E of insulated gate bipolar transistor IGBT; 2 pin connect+the 20V power supply; R1 is a gate electrode resistance, and 3 pin are connected to insulated gate bipolar transistor IGBT gate pole G by gate electrode resistance; The overcurrent protection signal of 5 pin output, be connected to the base stage of triode by optocoupler, the collector electrode of triode is transported to universal logic module 22 with the over current protecting self-locking signal, 6 pin are connected to the collector electrode of insulated gate bipolar transistor IGBT by fast diode D1 and voltage stabilizing didoe VZ3, be connected with between 1 pin and 3 pin voltage stabilizing didoe VZ1 (+15V) and VZ2 (+5V) be connected between resistance R 22 pin and 9 pin between 1 pin and 3 pin and be connected to capacitor C 1, be connected to capacitor C 2 between 1 pin and 9 pin, 14 pin, 15 pin are driving signal input, are connected to triode Q and pull-up resistor R3 on 14 pin; Universal logic module 22 is that programmable logic device and the 4000000 active crystal oscillators of XC9572 are formed by model, and the

22,38,64,73,78 of XC9572 connects+the 5V power supply;

8,16,27,42,49,60 connects+5V ground;

28,29,30,59 is connected to TDI, TMS, TCK and the TDO end of online programming mouth JTAG respectively; Pin 76 is connected with the output terminal of clock Clock of active crystal oscillator; Pin 1～6 can be connected with the over current protecting self-locking signal end Lock1～Lock6 of 6 road insulated gate bipolar transistor IGBTs respectively,

7,9,10,11,12,13 is connected with self-locking state Enable Pin Lockstate1～Lockstate6 respectively, and

14,15,17,18,19,20 is connected with the drive signal Input1～Input6 of master control set respectively;

21,23,24,25,26,31 is connected respectively to the gate pole of the triode that drive signal input pin 14 pin of 6 road EXB841 are connected.Active crystal oscillator 1 pin is unsettled, 2 pin ground connection, and 4 pin connect+the 5V power supply.The decoupling capacitor that has added a 0.1uF between 2 pin and 4 pin.

The operation principle of the present utility model and the course of work are as follows:

The measure and control device of hybrid electric power electronic circuit breaker is made up of master control set 1 and drive unit 2.Wherein master control set Hall voltage transducer, Hall current sensor, A/D sample circuit 11, AC signal zero crossing detection circuit 12, digital microprocessor 13, memory expansion circuit 14, be used to produce the CPLD CPLD 15 of control signal and open into the amount of leaving circuit, man-machine interface and communicating circuit 17 and form.Drive unit is made up of driver module 21 and CPLD Logic control module 22.This device work principle is seen Fig. 1.

After powering on, device assigns the order of closing a floodgate by man-machine interface, digital signal processor can detect the position of the contact of circuit breaker by CPLD, when eligible, make one to leave quantitative change and become high level, the drive circuit that this high level is delivered to power electronic device IGBT makes its conducting, this amount of leaving can make its combined floodgate by the closing coil of auxiliary relay (through time-delay) connection circuit breaker simultaneously, turn-offs power electronics IGBT device then.When this measure and control device behind the breaker closing can be by the AC signal on transducer, the A/D device detection line and the data after will changing simultaneously send digital signal processor processes, calculate effective value, frequency, power of each AC signal etc., when detecting fault, making the amount of leaving is high level, open the power electronics static switch earlier, switching winding through auxiliary relay connection circuit breaker makes its disconnection then, turn-offs electronic power switch simultaneously.In the circuit breaker break-make, utilize this measure and control device control electronic power switch elder generation conducting to realize the effect of shunting like this, shorten the make-and-break time of circuit breaker.

Measure and control device master control set part:

Voltage, current sensor and A/D sample circuit

This partial circuit is shown in Fig. 2,3.Wherein shown voltage among Fig. 2, the connecting mode of current sensor.Voltage sensor adopts the VSM500D Hall voltage transducer of camellia port, Nanjing connection sensing observation and control technology Co., Ltd in this measure and control device.The specified input voltage in the former limit of this transducer is 500V, and the secondary output-current rating is 20mA, just can obtain voltage on the former limit by multiply by conversion coefficient by measuring the voltage on the measuring resistance Rm on these transducer 8 pin like this.Current sensor adopts the HNC050LA Hall current sensor of Zhongxu Electronics Tech Co., Ltd. in this measure and control device.The specified measurement electric current in the former limit of this transducer is that 50A (AC/DC) secondary output current is 50mA (AC/DC).The terminal voltage of the measuring resistance of the measurement termination by measuring this transducer just can draw the value of the electric current on the former limit like this.Fig. 3 is the A/D sample circuit.Wherein the A/D conversion chip adopts the AD976A of U.S. AD company, 16 analog to digital converters of a kind of high speed of this chip, and its sampling rate is 100KSPS, can under single supply 5V electric power thus supplied, work, characteristics with extremely low power dissipation, input range are-10V～+ 10V, can satisfy the needs of device.AD channel selecting chip adopts the AD7506 chip of U.S. AD company, and this chip is the chip that 16 passages select 1 passage, by A0, A1, A2, the A3 pin assignment selector channel 0～15 to chip.Receive 0～15 passage of AD7506 after through the RC low-pass filtering from the measuring-signal of the secondary of voltage, current sensor, through channel selecting signal is sent among the AD976A and change, the result outputs to the DSP CONTROL unit.

Intermodule connects: this module mainly realizes AC sampling, so with 12 tunnel AC signal process transducer, the output of transducer is received successively Uab～Iback_4 end of low-pass filter circuit of resistance, the electric capacity of Fig. 3, the input that AN1～AN12 and ANT_-6 and ANT_+6 is connected to AD7506 is disconnected, A0～A3 of AD7506 is connected to the 63rd, 65,66,100 pin of digital signal processor, 16 position datawires of AD976 are connected on the data wire of digital signal processor simultaneously, and 26 pin of AD976 are connected to 36 pin of CPLD.

AC signal zero crossing detection circuit

AC signal zero crossing detection circuit as shown in Figure 4.Alternating voltage, current signal is through the Hall element conversion testing circuit through being made of resistance and operational amplifier CA1558 and 555 chip KA556, AC signal is transformed into the output output of square wave by KA556, KA556 is made of two 555 circuit, can be transformed into square-wave signal to the AC signal of two-way like this, square-wave signal is received 67 (CAP1) of TMS320F240 in the digital signal processor main control circuit, 68 (CAP2) pin can be provided with the DSP CONTROL register capturing unit is caught at the rising edge/trailing edge of AC signal.The capturing unit that utilizes digital signal processor to have produces in AC signal zero crossing and interrupts obtaining the time reference that the hybrid electric power electronic circuit breaker of control cut-offs.

Intermodule connects: this module realizes that AC signal zero crossing detects, and two outputs of KA556 are connected to 67,68 pin (capturing unit CAP1, CAP2) of digital signal processor.

The DSP CONTROL circuit

The DSP CONTROL circuit as shown in Figure 5.Wherein this control circuit is by the TMS320F240 chip of American TI Company, the X5043 hardware watchdog chip of U.S. Xicor company, and the 20MHz crystal oscillator, circuit constitutes.

In this measure and control device, DSP CONTROL partly is a core circuit, realize that the functions such as monitoring, driving, protection to circuit breaker must could realize by DSP chip.This chip of TMS320F240 has following characteristics: 1. instruction cycle of 50ns; 2. 544 words * 16 bit slices internal program/data dual port RAM; 3. the sheet internal program FLASH of 16K word; 4. event manager module EV wherein has general timing unit, comparing unit, capturing unit etc.; 5. two 10 AD conversion unit etc.These all make the F240 chip can realize data processing fast, make this chip be particularly suitable for the control of power device.X5043 is the hardware watchdog circuit, can guarantee the software reliable reset when the device software fault.Its control signal WDI, WD_SO, WS_SI, WDSCK are the control by CPU, export after CPLD inside is via signal transformation, referring to the introduction of CPLD module.From the hand-reset signal ERST of keyboard, the signal that automatically resets from 5043, R1 realizes together that with the electrify restoration circuit that EC1 forms three kinds of devices under the different situations reset, promptly manual, fault powers on.Thereby X5043 can expand memory as serial EEPROM simultaneously.The active crystal oscillator of 20MHz provides CPU the clock signal of work, exports the XTAL1/CLKIN pin of digital signal processor to.Conventional adopts the active crystal oscillator of 10MHz at TMS320F240, and it is in order to improve the digital signal processor dominant frequency, to shorten time for each instruction that this device adopts the 20MHz crystal oscillator.This device has the JTAG mouth of digital signal processor, can be by the signal TRST of JTAG mouth, TMS, TDI, TDO, EMU0, the detail programming of EMU1 implement device.

The main signal of DSP CONTROL circuit has following a few part:

1. 16 bit data bus D0～D15,16 bit address bus A0～A15, read-write control signal DS, PS, IS, READY, R/W, W/R, WE utilizes these signals to finish control and visit to external equipment.

2. interrupt signal NMI, KI_INT, KEY_INT, INT_CAN utilizes external interrupt and above-mentioned signal to finish control to keyboard and communication module together.

3. the channel selecting signal ADA0～ADA3 of AD module switches in order to the passage of control AD data acquisition module.

4. CAP1, CAP2 is the output signal of frequency measurement module, in order to the measuring voltage frequency.

5. signal DE, TXD, RXD, MCPRESET, TX0RTS, TX1RTS, TX2RTS are the control signals of communication module.

Under DSP chip control, the running that these signals do not stop is to realize the function of this measure and control device.

CPLD control signal circuit

The CPLD circuit is the part and parcel that produces a lot of control signals in this measure and control device, and digital signal processor is to the chip selection signal of some peripheral hardwares simultaneously, and leaves signal and also will produce in the CPLD circuit.This circuit as shown in Figure 7.CPLD adopts the XC95108 chip of U.S. Xilinx company, and this chip has 108 macrocells and 108 I/O pins are arranged.Can programme easily to realize certain logic input and output, can utilize the JTAG cause for gossip existing simultaneously the CPLD detail programming.

The CPLD module mainly contains following three functions (annotate: inner functional module as shown in Figure 8).

1. address decoding circuitry produces the chip selection signal and the control signal of peripheral hardware.Main signal has the read-write chip selection signal 1644 of (1) data memory module, DS, IS, the latch signal of DAT_CS and data, address (control logic figure sees Fig. 9).(2) control signal of liquid crystal control module (control logic is seen Figure 10) LCD, LCDRD, LCDWE, LCD_C/D, LCDRST, (3) the control logic signal WDT of house dog, WD_SI, WD_SO, WDSCK (control logic is seen Figure 11), (4) keyboard signal KEY1～KEY7 (control logic is seen Figure 12), AD conversion starting signal of (5) data acquisition and control module and chip selection signal AD976 and R/C (logic is seen Figure 13).

2. open into opening that the amount of leaving module provides, KI1～KI12, DL1～DL8, LOCAL, SET (logic diagram is seen Figure 14) into the amount of leaving signal.

3. waiting signal, READY is in order to realize the sequential coupling (logic diagram is seen Figure 15) of digital signal processor when visiting external equipment at a slow speed.

Open into amount, the amount of leaving circuit

Open into the function one of digital output circuit the switching value signal of on-the-spot 12V or 24V is isolated conversion, becoming can be by the electric signal of master board accurate recognition, the 2nd, the 5V signal that master board is sent is driven amplification, the control relay output action, the drive circuit of this signal being received power electronic device IGBT is controlled the break-make of IGBT simultaneously, thereby reaches the purpose that shortens the circuit breaker break-time.Its circuit diagram as shown in figure 16.

HEADER32

^*2 and CON6 and CON16 be respectively the terminal board of opening into leaving signal and extraneous contact.

Opening into amount signal IN1 to IN12 and common port INCOM on the terminal board CON6 at device back constitutes the loop, and HEADER32 is guided in the output after these amount of opening signals are isolated via photoelectricity coupling 521-4 ^*On 2, i.e. KI1～KI12, thereby and master control part divide and get in touch.

Signal on the terminal board CON16 at device back is the amount of the leaving signal of control power equipment action, and 8 tunnel actuating signal DL1～DL8 that master board is sent are via HEADER32 ^*2 interfaces drive through 8 9013 triodes respectively, and the 521-4 light-coupled isolation removes to drive 8 auxiliary relays, further amplifies its driving force, and its output signal is OUT1-1 on the terminal board CON16 to OUT8-2.Utilize the control of these 8 pairs of signals realizations to field apparatus.

Module connects: with HEADER32 ^*The terminal board of 2 terminal boards and IGBT drive circuit is corresponding to link to each other.

Man-machine interface and communicating circuit

Its circuit diagram of man-machine interface as shown in figure 17.It provides the Interface Terminal JP1 with LCD MODULE T6963C, and the signal that master board offers this terminal has: 8 bit data bus D0～D7; Reset signal LCDRST; Read-write control signal WR, RD; Director data channel selecting signal A0; The chip selection signal LCD of liquid crystal control (annotate: these signals are partly provided by CPLD), supply power voltage+5V and GND; And the negative pressure Vo that is used for LCD backlight control.

This circuit board also provides the Interface Terminal JP_CPU1 that gets in touch with the control signal of motherboard.Its signal that provides is controlled the signal L1～L7 of LED lamp on/off in addition except above-mentioned, serial communication signal 232R, 232T.Running mark lamp LED1～7 of device are normal in order to display unit, report to the police action, states such as electric power thus supplied, the RS232 serial ports J1 that the verifying unit of adjusting needs.Its control signal provides by JP_CPU1.

The communication interface module circuit diagram as shown in figure 18, device has adopted RS232/485 standard hardware interface, the SCI interface that carries by digital signal processor is realized.For traditional RS232/485 communication mode, the TXD that the SCI mouth of CPU sends, RXD becomes standard traffic level via MAX232 with the MAX485 level conversion with the DE signal, and wherein decide the signal of communication output of device by jumper switch SW1 is any in these two kinds of agreements actually.

This device also provides the field bus communication that meets CAN2.0B agreement interface simultaneously.This interface constitutes by CAN controller MCP2510 and CAN driver 82c250.

Measure and control device drive unit part

The EXB841 driver module

This module is the core of IGBT drive circuit, and major function is the signal of opening and turn-off IGBT that 1 reception control circuit sends, and converts corresponding driving voltage to and drives opening and turn-offing of IGBT.The IGBT high-speed driving chip that the EXB841 chip is produced for company of Fuji, it has advantages such as single supply, modularization, over-current detection, the soft shutoff of protection, and maximum operating frequency is 40kHz, and the maximum drive signal time-delay is 1.5us.EXB841 adopts Vce to detect identification overcurrent and soft turn-off protection in addition.IGBT is voltage-controlled device, and turning-on voltage is generally 12V～15V, shutoff voltage is generally-and 1V～-1OV.It is 15V that the IGBT that EXB841 provides opens driving voltage, turn-offs driving voltage to be-5V.EXB841 uses very extensively at present, but also exists some shortcomings simultaneously, as: exist protection blind area, overcurrent protection to start to control problems such as height a little was set.In order to remedy the deficiency that exists on these functions of EXB841, need to increase some peripheral circuits and come its driveability is improved and optimizes, to realize more reliable and stable driving.

Accompanying drawing 19 is road EXB841 drive circuit schematic diagram after improving.As shown in the figure: 1 pin meets the emitter-base bandgap grading E of IGBT; 2 pin connect+the 20V power supply; R1 is a gate electrode resistance, and tripod is connected to IGBT gate pole G by gate electrode resistance; 4 pin are used to connect external capacitive, to prevent the current foldback circuit misoperation, do not need electric capacity in most occasions, so unsettled in this circuit diagram; 5 pin output overcurrent guard signals are connected with external circuit by optocoupler.When IGBT was normal operating conditions, 5 pin voltages were 20V, not conducting of optocoupler Tlp521, and Lock pin output low level, when the overcurrent fault, 5 pin voltages are 0V, optocoupler conducting, Lock pin output high level.The Lock pin is connected to the over current protecting self-locking circuit as the sign of an over current fault signal, is judged whether to carry out over current protecting self-locking by the height of Lock pin level; 6 pin are connected to the collector electrode of IGBT by fast diode D1 and voltage stabilizing didoe VZ3.The purpose that adds voltage stabilizing didoe VZ3 be for the overcurrent protection that changes EXB841 start to control a little and shorten its protection blind area; Between 1 pin and 3 pin, add voltage stabilizing didoe VZ1 (+15V) and VZ2 (+5V) effect is to prevent from overvoltage to occur between gate pole and the emitter-base bandgap grading; The effect of connecting resistance R2 is to avoid the gate pole of IGBT and emitter-base bandgap grading to open circuit between 1 pin and 3 pin, should try one's best near power switch in its position; The effect of capacitor C 1, C2 is to attract not use as filter capacitor because the attached anti-supply power voltage that causes of power supply wiring changes; 14 pin, 15 pin are driving signal input, its inner employing has the optical coupler of high-isolating as Signal Spacing, when 14 pin and 15 pin had the electric current of 10mA to flow through, optical coupler was with regard to conducting, and the driven IGBT's by its internal circuit generation+15V is open-minded.For flow through 14,15 pin to open electric current enough big, externally adopt triode Q to add the way of drawing resistance R 3 on the circuit.

Module connects: this module functions is for producing driving voltage and the soft shutoff of overcurrent protection that drives IGBT.It with the CPLD Logic control module between be connected as follows: accept the Drive signal of CPLD Logic control module, promptly control the signal that IGBT cut-offs; In overcurrent, send the Lock signal, i.e. the over current protecting self-locking signal to the CPLD Logic control module.

The CPLD Logic control module

This module functions is: (1) is as a logic interfacing between digital signal processor master control borad and the EXB841 drive circuit; under normal operation, accept opening and turn-offing (2) over current protecting self-locking function: when circuit generation over current fault from the drive signal of digital signal processor master control borad and with what it outputed to corresponding EXB841 drive circuit control IGBT; EXB841 enters over-current detection, implements the soft shutoff of overcurrent.Utilize the over current protecting self-locking function to block the drive signal of 14 pin and 15 pin by force this moment, guarantees the time of soft shutoff, prevents that IGBT from damaging owing to turn-offing fast under the short-circuit conditions.After fault clearance, locking can automatically terminate, and input signal can carry out driven.

Accompanying drawing 20 is the circuit diagram of CPLD Logic control module, is made up of CPLD and active crystal oscillator.The model of CPLD is the XC9572 of Xilinx company, and the frequency of active crystal oscillator is 4MHz.As shown in the figure, form the CPLD logic control circuit by XC9572 and active crystal oscillator and finish the break-make control and over current protecting self-locking function of 6 road IGBT drive circuits at this.XC9572 has 84 pins, and input and output voltage is followed the Transistor-Transistor Logic level standard, high level 5V, low level 0V.Pin 22,38,64,73,78 connects+the 5V power supply; Pin 8,16,27,42,49,60 connects+5V ground; Pin 28,29,30,59 uses as TDI, TMS, TCK and the TDO end of JTAG mouth respectively; Pin 76 is as the clock Clock input of active crystal oscillator; Pin 1～6 connects over-current signal sign Lock1～Lock6 that 6 road IGBT drive respectively, overcurrent occurs when the Lock pin shows during for high level, when the Lock pin shows no overcurrent appearance during for low level; Pin 7,9,10,11,12,13 connects Lockstate1～Lockstate6 respectively, Lockstate is a sign amount, the height of its level can carry out artificial setting by the jumper wire device on the circuit board, need carry out over current protecting self-locking when Lockstate shows during for high level, not need to carry out over current protecting self-locking when Lockstate shows during for low level; Pin 14,15,17,18,19,20 connects the drive signal Input1～Input6 from master control borad respectively; Pin 21,23,24,25,26,31 is an output pin, output IGBT drive signal, they are connected respectively to the gate pole of the triode that drive signal input pin 14 pin of 6 road EXB841 are connected, and drive opening and turn-offing of EXB841 internal insulation optocoupler by triode.

Accompanying drawing 21 is one tunnel internal logic circuit figure wherein in 6 road CPLD logic control circuits.As shown in the figure, 1,7,14,76 pin are signal input pin, meet Lock1, Lockstate1, Input1 and Clock respectively.Lockstate1 generally is made as high level when reality is used.21 pin output drive signal DRIVE1.U3 is 6 digit counters, and FDC is a d type flip flop, uses as voltage follower at this.When over current fault not occurring, Lock1 is a low level, the clear terminal CLR of counter U3 and voltage follower FDC is input as high level, the output zero clearing of U3 and FDC, OUTPUT1 is a high level, the output drive signal DRIVE1 of CPLD drives the normal break-make of IGBT with the drive signal INPUT1 unanimity of master control borad by EXB841 at this moment.When over current fault occurring, Lock1 is a high level, the clear terminal CLR of U3 and FDC is input as low level, the pulse signal that U3 accepts active crystal oscillator begins counting, when U3 counting is output as 010100 (20*0.25=5us) NAND6 be output as jump to by height low, the output of voltage follower is jumped to height and is kept high level by low accordingly, OUTPUT1 jumps to low by height and keeps low level, this moment, drive signal DRIVE1 saltus step was low, promptly realized the soft shutoff of time-delay behind the 5us behind the 5 pin output fault-signal Lock1 of EXB841.Between age at failure, Lock1 and Lockstate1 are high level, so LOCKENABLE1 is a high level, or the output of door OR2 is always high, realized the blockade to input signal Input1.After fault was eliminated, Lock1 saltus step immediately was a low level, removed the blockade to input signal Input1.

Claims

1, a kind of Mixed Electric And Electronic Circuit Breaker Measuring And Control Device that belongs to power transmission and distribution equipment, form by master control set (1) and drive unit (2), it is characterized in that master control set is by the Hall voltage transducer, Hall current sensor, A/D sample circuit (11), AC signal zero crossing detection circuit (12), digital signal processor (13), be used to produce the programmable logic controller (PLC) (15) of control signal and open into the amount of leaving circuit and form, the voltage of main circuit, current signal is through Hall voltage, after the current sensor conversion, output is connected to the A/D sample circuit, after the A/D sampling, the result is placed on data wire reads by digital signal processor (13); Programmable logic controller (PLC) (15) produces control signal and comes control figure signal processor (13) and A/D sample circuit (11), drive unit is made up of driver module (21) and universal logic module (22), and universal logic module (22) is transported to driver module (21) with drive signal; Driver module (21) is transported to universal logic module (22) with the over current protecting self-locking signal; universal logic module (22) is transported to driver module with the soft cut-off signals of overcurrent, and the control signal that master control set produces programmable logic controller (PLC) (15) is transported to the universal logic module (22) of drive unit.

2, Mixed Electric And Electronic Circuit Breaker Measuring And Control Device according to claim 1, it is characterized in that voltage sensor adopts VSM500D Hall voltage transducer, current sensor adopts the HNC050LA Hall current sensor, A/D sample circuit (11) is that the sampling A of AD976A and multichannel that model is AD7506 select chip to form by model, be connected to 1 pin as 28 pin of the AD7506 of output as the AD976A of input, digital signal processor (13) adopts the TMS320F240 chip, the Hall voltage transducer, the measuring junction of Hall current sensor, receive resistance successively, the input of the low-pass filter circuit of electric capacity, (AN1～AN12) and reference voltage signal (ANT_-6 and ANT_+6) are connected to the input of AD7506 with the signal after the low-pass filtering, A0～A3 of AD7506 is connected to the 63rd of digital signal processor (13), 65,66,100 pin, 16 position datawires of AD976 are connected on the data wire of digital signal processor (13) simultaneously, and 26 pin of AD976 are connected to 36 pin of CPLD.

3, Mixed Electric And Electronic Circuit Breaker Measuring And Control Device according to claim 1, it is characterized in that programmable logic controller (PLC) (15) is made up of XC95108 chip and online programming mouth (JTAG), wherein the pin 22,38,64,64,78 of XC95108 connects+the 5V power supply; Pin 8,27,42,60 ground connection; Pin 28,29,30,59 respectively as the TDI of online programming mouth (JTAG), TMS, TCK and TDO end, and between power supply and ground, connect the 0.1uF leaded multilayer ceramic capacitor and the 10uF electrochemical capacitor comes uncoupling, XC95108 pin of chip 1,2,3,4,5,6,7,9 receive the data wire D0～D7 of digital signal processor (13), XC95108 pin of chip 10,11,12,14,15 meet display module LCD respectively, LCDRD, LCDWE, LCDC/D, the LCDRST pin, pin 13 connects the CLKOUT pin of digital signal processor (13), pin 17,18,19,20,21,23,24,25 meet the A8 of digital signal processor (13) respectively, A9, A10, A11, A12, A13, A14, the A15 pin, pin 26 connects the DS pin of digital signal processor (13), pin 31,32,33,34,35 meet the IS of digital signal processor (13) respectively, W/R, READY, pin 36 connects the AD976 pin of A/D sample circuit (11), pin 37,39 connect the WE and the R/C pin of digital signal processor (13) respectively, pin 43,44,45,46,47,48,50,51,52,53,54,55,56,57,58,61,62,63,65,66,67 are connected to respectively and open into leaving module KI1～KI12 and DL1～DL8 pin, pin 70,71,72,74 meet 6 of reset circuit X5043 respectively, 2,5,1 pin, pin 76,77,79,80,81,82,83,84 connect the KEY7～KEY0 pin of keyboard.

4, Mixed Electric And Electronic Circuit Breaker Measuring And Control Device according to claim 1, it is characterized in that on the data wire of digital signal processor (13), being connected with memory expansion circuit (14), memory expansion circuit (14) is made up of two static data memory CY7c1021-15vc and non-volatile data storage DS1644 chip, 16 bit address lines of this circuit, 16 position datawires, pin WE, pin W/R, pin PS and digital signal processor (13) respective pin A0～A15, D0～D15, WE, W/R, the PS pin connects, pin 1644, pin DAR_CS respectively with 34 of CPLD, 35 pin link to each other.

5, Mixed Electric And Electronic Circuit Breaker Measuring And Control Device according to claim 1, it is characterized in that it is the chip for driving of EXB841 that driver module (21) is selected model for use, 1 pin that is connected with insulated gate bipolar transistor (IGBT) and chip for driving on chip for driving meets the emitter-base bandgap grading E of insulated gate bipolar transistor (IGBT); 2 pin connect+the 20V power supply; R1 is a gate electrode resistance, and 3 pin are connected to insulated gate bipolar transistor (IGBT) gate pole G by gate electrode resistance; The overcurrent protection signal of 5 pin output; be connected to the base stage of triode by optocoupler; the collector electrode of triode is transported to universal logic module (22) with the over current protecting self-locking signal; 6 pin are connected to the collector electrode of insulated gate bipolar transistor (IGBT) by fast diode D1 and voltage stabilizing didoe VZ3; be connected with between 1 pin and 3 pin voltage stabilizing didoe VZ1 (+15V) and VZ2 (+5V) be connected between resistance R 22 pin and 9 pin between 1 pin and 3 pin and be connected to capacitor C 1; be connected to capacitor C 2 between 1 pin and 9 pin; 14 pin; 15 pin are driving signal input, are connected to triode Q and pull-up resistor R3 on 14 pin.

6, Mixed Electric And Electronic Circuit Breaker Measuring And Control Device according to claim 1, it is characterized in that universal logic module (22) is that programmable logic device and the 4000000 active crystal oscillators of XC9572 are formed by model, the pin 22,38,64,73,78 of XC9572 connects+the 5V power supply; Pin 8,16,27,42,49,60 connects+5V ground; Pin 28,29,30,59 is connected to TDI, TMS, TCK and the TDO end of online programming mouth (JTAG) respectively; Pin 76 is connected with the output terminal of clock Clock of active crystal oscillator; Pin 1～6 can be connected with the over current protecting self-locking signal end Lock1～Lock6 of 6 road insulated gate bipolar transistors (IGBT) respectively, pin 7,9,10,11,12,13 is connected with self-locking state Enable Pin Lockstate1～Lockstate6 respectively, and pin 14,15,17,18,19,20 is connected with the drive signal Input1～Input6 of master control set respectively; Pin 21,23,24,25,26,31 is connected respectively to the gate pole of the triode that drive signal input pin 14 pin of 6 road EXB841 are connected, and active crystal oscillator 1 pin is unsettled, 2 pin ground connection, and 4 pin connect+the 5V power supply, have added the decoupling capacitor of a 0.1uF between 2 pin and 4 pin.