CN106546806A - Current sensing means with Gain Automatic regulation and telecommunications functions - Google Patents
Current sensing means with Gain Automatic regulation and telecommunications functions Download PDFInfo
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Abstract
The invention provides a kind of current sensing means with Gain Automatic regulation and telecommunications functions, including：Current circuit, automatic gain adjusting circuit, radio communication circuit and single chip circuit.Current circuit is connected with automatic gain adjusting circuit, single chip circuit respectively, and automatic gain adjusting circuit is connected with single chip circuit；Current circuit is used for the electric current and voltage signal for detecting access device；Automatic gain adjusting circuit is for carrying out gain-adjusted to the current circuit input voltage signal and be delivered to single chip circuit after current values signal is amplified；Single chip circuit is used to control the break-make of the current circuit, and feed-in radio communication circuit after the current direction signal of input, current values signal are changed by A/D.Present invention achieves the automatic detection of electric current, eliminates signal processing link and the corresponding hardware circuits such as accurate sampling, amplification and conditioning, reduces the cost of detection circuit, improve certainty of measurement.
Description
Technical field
The present invention relates to electric detective technology, in particular it relates to based on Hall current sensor with Gain Automatic tune
The current sensing means of section and telecommunications functions.
Background technology
Small and special electric machine is a kind of small-sized direct current generator, automobile rearview mirror, hard disk drive, VCD, DVD, MP3 and
It is used widely in the devices such as MP4.To improve the reliability and quality of product, the small and special electric machine and complete to adopting is needed
Detected into the product after assembling, especially detect size of current and direction motor working condition to be determined with assembling
Product quality afterwards.Although size of current and direction can be measured or using in voltage gear measuring circuit using circuit tester current gear
The artificial judgment sense of current and size after the relative voltage difference at sampling resistor two ends, but the sense of current and size cannot be realized
Automatic detection.
To realize the automatic measurement of size of current and direction, Burn Brown, Maxim, Interil, Microchip and
The companies such as Linear produce a large amount of high side current detecting chips.In addition to price is high and market is difficult buying, these chips are also
Have the shortcomings that typically adopting SMT encapsulation form to be not easy to replacing and V ends needs particular job voltage, limits high side electric current
The application of detection chip.The companies such as Infineon, Melexis, Honeywell, Allegro and NEC-Tokin produce
A large amount of GAP TYPE Hall current sensors, but these sensors are typically all used for the detection of more than 100A high currents, no
It is applied to<The detection of the small current of 100mA, is also not used to current detecting and the quality inspection using small and special electric machine product.
Jing had found to the literature search of prior art, Worldwide Electric Group Co., Ltd. it is entitled：A kind of " soft of low pressure
The automatic gain regulating current detection circuit of dynamic device ", Application No.：201120268941.5 utility model patent in
Low Voltage Soft Starter is realized using automatic gain regulating current detection circuit, this belongs to low pressure soft starter device technology neck
Domain, is mainly used in the detection of low pressure solid state soft starting device automatic gain control electric current.From the invention belongs to different technology
Field, does not automatically open up function and telecommunications functions with circuit.Wang Shaowei exists《Computer and network》(2009
4th the 609-610 page of phase) on " design of online current detecting wireless alarm system " delivered set using integrated transporting discharging
Current comparison circuit is counted, the communication with main frame has been realized by wireless communication technology.This is designed primarily for national grid
The fault detect of high voltage power transmission and transforming circuit.From the invention belongs to different technical field, does not automatically open up function with circuit
With electric current automatic gain control function.
The present invention provides a kind of current sensing means based on Hall current sensor, with Gain Automatic regulatory function, fits
Close the high-acruracy survey of small current；Function is automatically opened up with radio communication function and circuit, is easy to as wireless sensing section
Point accesses Internet of Things.It is suitable for the automatic detection devices such as the automobile rearview mirror and small and special electric machine of small current.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of have Gain Automatic regulation and telecommunication
The current sensing means of function.
According to the present invention provide with it is Gain Automatic regulation and telecommunications functions current sensing means, including：Electricity
Current circuit, automatic gain adjusting circuit, radio communication circuit and single chip circuit, the current circuit respectively with automatically
Gain adjusting circuit, single chip circuit are connected, and the automatic gain adjusting circuit is connected with single chip circuit, the monolithic
Electromechanical road is connected with radio communication circuit and can realize telecommunication and intelligent node function；
- the current circuit, for detecting the electric current and voltage signal of access device, wherein, the electric current side that will be detected
Single chip circuit is delivered to signal, the voltage signal for detecting is delivered to into automatic gain adjusting circuit；
- the automatic gain adjusting circuit, for gain-adjusted is carried out to the current circuit input voltage signal, and will
Wherein represent current values size signal be amplified after be delivered to single chip circuit；
- the single chip circuit, for controlling the break-make of the current circuit, and by current circuit, automatic gain control
The current direction signal of circuit input, current values signal are encoded after A/D conversions, obtain encoded signal, will
The encoded signal feed-in radio communication circuit；
- the radio communication circuit, for the encoded signal of single chip circuit is sent to remote master computer, realizes
Internet of Things intelligent node function.
Preferably, the current circuit includes：Joint J1, joint J2, relay K1, fly-wheel diode V1, three poles
Pipe Q1, resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, Hall current sensor U1 and comparator core
Piece U2；Wherein, the first pin P1 of joint J1, the first pin P2 are connected to the of the Hall current sensor U1
One input pin IN1, the second input pin IN2 of the Hall current sensor U1 are connected to the COM of relay K1
Pin, the pin GND ground connection of the Hall current sensor U1, the pin VCC of the Hall current sensor U1 connect
Power supply VCC is met, and the pin VCC of the Hall current sensor U1 is also connected to the Hall current by electric capacity C1
The output pin OUT of the pin GND of sensor U1, the Hall current sensor U1 is connected to the automatic gain and adjusts
Economize on electricity road, the output pin OUT1 of the Hall current sensor U1, pin OUT2 are respectively connecting to single chip circuit；
The negative pole of the fly-wheel diode V1 is connected to second coil port L2 of power supply VCC, relay K1, the afterflow two
The positive pole of pole pipe V1 is connected to the colelctor electrode of the first coil port L1 and audion Q1 of the relay K1, and described three
The grounded emitter of pole pipe Q1, the base stage of the audion Q1 are connected to the output of comparator chip U2 by resistance R1
The base stage of pin OUT, the audion Q1 is also connected with one end of resistance R2, and the other end of the resistance R2 is connected to list
Piece electromechanics road；The NO ports of the relay K1 are connected to the first pin P1 and the first pin P2 of joint J2；It is described
The positive input pin IN+ of comparator chip U2 is connected to the NO ports of the relay K1, the comparator chip U2
Negative input pin IN-, pin VSS, pin GND be grounded, the pin VDD of the comparator chip U2 is connected to
Power supply VCC is simultaneously grounded by electric capacity C2, and the output pin OUT of the comparator chip U2 is connected to by resistance R3
Power supply VCC.
Preferably, the automatic gain adjusting circuit includes：Electric capacity C3, electric capacity C4, electric capacity C5, resistance R4, resistance
R5, resistance R6, high accuracy integrated transporting discharging U3 and digital regulation resistance U4, one end of wherein resistance R4 are connected to electric current electricity
The other end of the output pin OUT of the Hall current sensor U1 in road, the resistance R4 is connected to described high-precision
The positive input pin IN+ of degree integrated transporting discharging U3, the negative input pin IN- of the high accuracy integrated transporting discharging U3 are connected to number
The pin W of the pin H of word potentiometer U4, the digital regulation resistance U4 is connected to the defeated of the high accuracy integrated transporting discharging U3
Go out pin OA, the pin VDD of the digital regulation resistance U4 is connected to power supply VCC and is grounded by electric capacity C4；The height
The positive voltage pin V+ of precision integrated transporting discharging U3 is connected to power supply VCC and is grounded by electric capacity C3, and the high accuracy is integrated
The negative voltage pin V- ground connection of amplifier U3；The output pin OA of the high accuracy integrated transporting discharging U3 is connected to resistance R6
One end, the other end of the resistance R6 is connected to single chip circuit and is grounded by electric capacity C5, the digital regulation resistance
The pin GND ground connection of U4, the CS pins of the digital regulation resistance U4, UD pins are connected to single chip circuit.
Preferably, the radio communication circuit includes：Electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, less radio-frequency
Chip U5, resistance R8 and crystal oscillator X1, wherein, the pin SDI of the radio frequency chip U5, pin SCK, pin
SS, pin IRQ, pin FSK are connected to single chip circuit, and the pin VSS of the radio frequency chip U5 is grounded,
The pin VDD of the radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C6；The less radio-frequency core
The pin MOD of piece U5 is connected to one end of resistance R8, and the other end of the resistance R8 is connected to power supply VCC and passes through
Electric capacity C7 is grounded；The pin RFP of the radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C8,
The pin RFN of the radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C9, the less radio-frequency core
The pin XTL of piece U5 is grounded by crystal oscillator X1.
Preferably, single chip circuit includes：Single-chip microcomputer U6 and electric capacity C11, wherein, the pin VDD of the single-chip microcomputer U6
It is connected to power supply VCC and is grounded by electric capacity C11, the pin IRQ of the single-chip microcomputer U6 is connected to radio communication circuit
In radio frequency chip U5 pin IRQ, the pin SCL of the single-chip microcomputer U6 is connected in radio communication circuit
The pin FSK of radio frequency chip U5, the pin SS of the single-chip microcomputer U6 are connected to wirelessly penetrating in radio communication circuit
The pin MOSI of the pin SS of frequency chip U5, single-chip microcomputer U6 is connected to the radio frequency chip U5 in radio communication circuit
Pin SDI, the pin SCK of single-chip microcomputer U6 is connected to the pin SCK of the radio frequency chip U5 in radio communication circuit；
The pin VSS ground connection of the single-chip microcomputer U6, the pin PTA0 of the single-chip microcomputer U6 is connected to described in current circuit
The pin PTA1 of the pin OUT1 of Hall current sensor U1, the single-chip microcomputer U6 is connected to described in current circuit
The pin PTA2 of the pin OUT2 of Hall current sensor U1, the single-chip microcomputer U6 is connected to described in current circuit
The other end of resistance R2, the pin PTA3 of the single-chip microcomputer U6 are connected to the Hall current sensing in current circuit
The pin PTA3 of the pin OUT1 of device U1, the single-chip microcomputer U6 is connected to the numeral in automatic gain adjusting circuit
The pin PTB0 of the pin CS of potentiometer U4, the single-chip microcomputer U6 is connected to the number in automatic gain adjusting circuit
The pin U/D of word potentiometer U4；The pin ADP5 of the single-chip microcomputer U6 is connected to described in automatic gain adjusting circuit
The other end of resistance R6
Preferably, described relay K1, using HK4100F-DC5V-SHG relays；Described fly-wheel diode V1,
Using IN4007 diodes；Described audion Q1, using S9013 audions；Described Hall current sensor U1,
Using THS-65 Hall current sensors；Described comparator chip U2, using LM311 chips.
Preferably, the high accuracy integrated transporting discharging U3 adopts OP196 high accuracy integrated transporting discharging chips；Described numeral electricity
Position device U4 adopts CAT5120 chips.
Preferably, described radio frequency chip U5 adopts SI4020 chips.
Preferably, described single-chip microcomputer U6 adopts MC9S08SH8 single-chip microcomputers.
Compared with prior art, the present invention has following beneficial effect：
1st, the current sensing means with Gain Automatic regulation and telecommunications functions that the present invention is provided directly adopts Hall
Current sensor and 8 MCU chips realize that I/V is converted and A/D conversions, eliminate accurate sampling, amplification and conditioning etc.
Signal processing link and corresponding hardware circuit, reduce the cost of detection circuit, improve certainty of measurement.
2nd, the current sensing means with Gain Automatic regulation and telecommunications functions that the present invention is provided adopts less radio-frequency
Communication mode, without the need for laying communication line in addition, range of application is wider.
3rd, the current sensing means with Gain Automatic regulation and telecommunications functions that the present invention is provided is in current circuit
Access comparator link, is also capable of achieving current circuit certainly without remote master computer accessing when motor waits detection device
Dynamic opening function；Using digital regulation resistance as feedback resistance, make system that there is Gain Automatic regulatory function, so as to improve
Accuracy of detection and reliability.
4th, the current sensing means with Gain Automatic regulation and telecommunications functions that the present invention is provided is using with piece
Clock circuit, the single-chip microcomputer of reset circuit, can stable works without the need for outer clock circuit and reset circuit used as main control chip
Make.
Description of the drawings
By reading the detailed description made to non-limiting example with reference to the following drawings, other of the present invention are special
Levy, objects and advantages will become more apparent upon：
The block diagram with Gain Automatic regulation and the current sensing means of telecommunications functions that Fig. 1 is provided for the present invention；
The electric current electricity with Gain Automatic regulation and the current sensing means of telecommunications functions that Fig. 2 is provided for the present invention
Road schematic diagram；
The automatic increasing with Gain Automatic regulation and the current sensing means of telecommunications functions that Fig. 3 is provided for the present invention
Benefit adjusts circuit diagram；
The channel radio with Gain Automatic regulation and the current sensing means of telecommunications functions that Fig. 4 is provided for the present invention
Letter circuit diagram；
The single-chip microcomputer with Gain Automatic regulation and the current sensing means of telecommunications functions that Fig. 5 is provided for the present invention
Circuit diagram.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to those skilled in the art
Member further understands the present invention, but the invention is not limited in any way.It should be pointed out that the common skill to this area
For art personnel, without departing from the inventive concept of the premise, some deformations and improvement can also be made.These belong to
Protection scope of the present invention.
Specifically, as shown in figure 1, the present invention includes：Current circuit a, automatic gain adjusting circuit b, radio communication
Circuit c and single chip circuit d, current circuit a are connected with automatic gain adjusting circuit b and single chip circuit d, monolithic
Electromechanical road d is connected with radio communication circuit c and realizes telecommunication and intelligent node function.
When the current sensing means energization work of the present invention, access motor and wait detection device, current circuit a is in monolithic
Open under the control of electromechanical road d or automatically open up under comparator control, Hall current sensor outbound course signal is to list
Piece electromechanics road d.Meanwhile, Hall current sensor exports analogue signal corresponding with electric current to automatic gain adjusting circuit b,
The analogue signal that Hall current sensor is exported linearly is amplified to the accurate of single chip circuit d by auto-gain circuit b automatically
In analog voltage conversion range, the high-acruracy survey of small current is realized.Every special time, single chip circuit d will be detected
To current values and direction signal Jing radio communication circuit c send to remote master computer, realize long-distance intelligent node
Function.When current values exceed rating number or setting numerical value, single chip circuit d exports shutdown signal to current circuit
A, realizes overcurrent protection function.
Specifically, as shown in Fig. 2 current circuit a includes：Joint J1, joint J2, relay K1, two pole of afterflow
Pipe V1, audion Q1, resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, Hall current sensor U1
With comparator chip U2；Wherein, the first pin P1 of joint J1, the first pin P2 are connected to the Hall current and pass
The second input pin IN2 of the first input pin IN1 of sensor U1, the Hall current sensor U1 is connected to relay
The COM pins of device K1, the pin GND ground connection of the Hall current sensor U1, the Hall current sensor U1
Pin VCC connection power supply VCC, and the pin VCC of the Hall current sensor U1 is also connected to by electric capacity C1
The pin GND of the Hall current sensor U1, the output pin OUT of the Hall current sensor U1 are connected to institute
Automatic gain adjusting circuit is stated, the output pin OUT1 of the Hall current sensor U1, pin OUT2 are respectively connecting to
Single chip circuit；The negative pole of the fly-wheel diode V1 is connected to second coil port L2 of power supply VCC, relay K1,
The positive pole of the fly-wheel diode V1 is connected to the current collection of the first coil port L1 and audion Q1 of the relay K1
Pole, the grounded emitter of the audion Q1, the base stage of the audion Q1 are connected to comparator core by resistance R1
The base stage of the output pin OUT of piece U2, the audion Q1 is also connected with one end of resistance R2, and the resistance R2's is another
One end is connected to single chip circuit；The NO ports of the relay K1 are connected to the first pin P1 and first of joint J2
Pin P2；The positive input pin IN+ of the comparator chip U2 is connected to the NO ports of the relay K1, described
The negative input pin IN- of comparator chip U2, pin VSS, pin GND are grounded, the comparator chip U2's
Pin VDD is connected to power supply VCC and is grounded by electric capacity C2, and the output pin OUT of the comparator chip U2 passes through
Resistance R3 is connected to power supply VCC.
Described relay K1, using HK4100F-DC5V-SHG relays, HK4100F-DC5V-SHG relays are remittance
+ 5V coil drive the voltages of company of section, single channel are normally opened, the normally closed six contacts micromachine relay of single channel.Running parameter：
AC220V/3A or DC30V/3A.
Described fly-wheel diode V1, using IN4007 diodes, IN4007 diodes are by Dc Components companies
Production.Running parameter:Maximum allowable backward voltage 1000V, maximum forward allow electric current 1.0A.
Described audion Q1, using S9013 audions, S9013 audions Q1 is produced by ETC companies.Work ginseng
Number:DC current gain 300,0.2 μ A of collector cutoff, 0.1 μ A of emitter cut-off current.
Described Hall current sensor U1, using THS-65 Hall current sensors, THS-65 Hall current sensors
For the Hall current sensor of Japanese NEC-Tokin companies production.Running parameter：+ 4.5-5.5V of running voltage, work(
10-12mA of power consumption stream, detects 0-120mA of current range.When RL=10k Ω are loaded, simulation output>3.5V.
Described comparator chip U2, using LM311 chips, LM311 chips are the comparator chip of NXP companies production.
Running parameter：Running voltage ± 30V, maximum input bias current 150nA, sensitivity 200V/mV.
As shown in figure 3, automatic gain adjusting circuit b includes：Electric capacity C3, electric capacity C4, electric capacity C5, resistance R4, electricity
Resistance R5, resistance R6, high accuracy integrated transporting discharging U3 and digital regulation resistance U4, one end of wherein resistance R4 is connected to electric current
The output pin OUT of the Hall current sensor U1 in circuit, the other end of the resistance R4 are connected to the height
The negative input pin IN- of the positive input pin IN+ of precision integrated transporting discharging U3, the high accuracy integrated transporting discharging U3 is connected to
The pin W of the pin H of digital regulation resistance U4, the digital regulation resistance U4 is connected to the high accuracy integrated transporting discharging U3
Output pin OA, the pin VDD of the digital regulation resistance U4 is connected to power supply VCC and is grounded by electric capacity C4；Institute
The positive voltage pin V+ for stating high accuracy integrated transporting discharging U3 is connected to power supply VCC and is grounded by electric capacity C3, the high accuracy
The negative voltage pin V- ground connection of integrated transporting discharging U3；The output pin OA of the high accuracy integrated transporting discharging U3 is connected to resistance
One end of R6, the other end of the resistance R6 are connected to single chip circuit and are grounded by electric capacity C5, the digital current potential
The pin GND ground connection of device U4, the CS pins of the digital regulation resistance U4, UD pins are connected to single chip circuit.
The high accuracy integrated transporting discharging U3 adopts OP196 high accuracy integrated transporting discharging chips, OP196 high accuracy integrated transporting discharging cores
Piece is the high accuracy integrated transporting discharging chip of the rail-to-rail output of Analog Device companies production.Running parameter：Work electricity
+ 3～12V of pressure, gain bandwidth 450kHz, 60 μ A of power consumption, bias voltage<300 μ V, open-loop gain is 500V/mV.
Described digital regulation resistance U4 adopts CAT5120 chips, and CAT5120 chips are the 2 of ON semi companies production
Line interface digital programmable potentiometer.Running parameter：+ 2.7～5.5V of running voltage, 0.5 μ A of standby current, 16 take out
Head, 10k Ω resistances.
As shown in figure 4, described radio communication circuit c includes：Electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9,
Radio frequency chip U5, resistance R8 and crystal oscillator X1, wherein, the pin SDI of the radio frequency chip U5, pin
SCK, pin SS, pin IRQ, pin FSK are connected to single chip circuit, the pin of the radio frequency chip U5
VSS is grounded, and the pin VDD of the radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C6；It is described
The pin MOD of radio frequency chip U5 is connected to one end of resistance R8, and the other end of the resistance R8 is connected to power supply
VCC is simultaneously grounded by electric capacity C7；The pin RFP of the radio frequency chip U5 is connected to power supply VCC and by electric capacity
C8 is grounded, and the pin RFN of the radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C9, the nothing
The pin XTL of line radio frequency chip U5 is grounded by crystal oscillator X1.
Described radio frequency chip U5 adopts SI4020 chips, and SI4020 chips are the production of Silicon Lab companies
Less radio-frequency transmitter chip.Running parameter：+ 2.2～5.4V of running voltage, 0.3 μ A of current power dissipation,
315/433/868/915MHz ISM working frequency range, highest 256kbps traffic rate, EEPROM and Microcontroller
Mode of operation.
As shown in figure 5, described single chip circuit d includes：Single-chip microcomputer U6 and electric capacity C11, wherein, the single-chip microcomputer
The pin VDD of U6 is connected to power supply VCC and is grounded by electric capacity C11, and the pin IRQ of the single-chip microcomputer U6 is connected to
The pin IRQ of the radio frequency chip U5 in radio communication circuit, the pin SCL of the single-chip microcomputer U6 are connected to wirelessly
The pin SS of the pin FSK of the radio frequency chip U5 in telecommunication circuit, the single-chip microcomputer U6 is connected to radio communication electricity
The pin MOSI of the pin SS of the radio frequency chip U5 in road, single-chip microcomputer U6 is connected to the nothing in radio communication circuit
The pin SCK of the pin SDI of line radio frequency chip U5, single-chip microcomputer U6 is connected to the less radio-frequency core in radio communication circuit
The pin SCK of piece U5；The pin VSS ground connection of the single-chip microcomputer U6, the pin PTA0 of the single-chip microcomputer U6 are connected to
The pin OUT1 of the Hall current sensor U1 in current circuit, the pin PTA1 of the single-chip microcomputer U6 are connected to
The pin OUT2 of the Hall current sensor U1 in current circuit, the pin PTA2 of the single-chip microcomputer U6 are connected to
The other end of the resistance R2 in current circuit, the pin PTA3 of the single-chip microcomputer U6 are connected in current circuit
The pin OUT1 of the Hall current sensor U1, the pin PTA3 of the single-chip microcomputer U6 are connected to automatic gain control
The pin PTB0 of the pin CS of the digital regulation resistance U4 in circuit, the single-chip microcomputer U6 is connected to automatic gain tune
The pin U/D of the digital regulation resistance U4 in economize on electricity road；The pin ADP5 of the single-chip microcomputer U6 is connected to automatic gain
Adjust the other end of the resistance R6 in circuit.
Described single-chip microcomputer U6 adopts MC9S08SH8 single-chip microcomputers, MC9S08SH8 single-chip microcomputers to produce for Freescale companies
8 Flash MCU chips.Running parameter：Flash is 8K, and RAM is 256B, and cpu frequency is 40MHz, work
Make voltage for+2.7-5.5V, ADC is 10 12 passages, the analog comparater ACMP with interrupt function is asynchronous logical
The letter line serial ports IIC of serial ports UART, synchronous communication serial ports SPI, two, 22 passage, 16 digit counter TPMx etc..
Specifically, after the current sensing means of the present invention accesses 5.0V working powers, the measurement port for treating side motor
It is connected with joint J1 and joint J2, the adhesive under Single-chip Controlling or comparator drives of relay K1 coils, formation are treated
Detection current loop.Hall element outbound course signal is judged to single chip circuit d for the sense of current.Hall is passed
The voltage analog signal feed-in automatic gain adjusting circuit b of sensor output, automatic gain adjusting circuit b will represent electric current number
The analogue signal of value size is amplified, and the A/D pins for sending into single chip circuit d realize the accurate measurement of current values.In spy
In fixing time, single chip circuit d sends the current data for detecting and direction signal Jing radio communication circuit c to master control
Computer, when the electric current for detecting exceedes rating number or setting numerical value, single chip circuit d sends shutdown signal to electricity
Flow back to road and close relay, realize the overcurrent protection of current circuit a.
Further, because of clock circuit and reset circuit on buccal tablet in single chip circuit d, in single chip circuit d
MC9S08SH8 single-chip microcomputers U6 can normal work without the need for outer clock circuit and reset circuit.Saving hardware cost and electricity
While the plate suqare of road, EMC the and EMI abilities of system are improve.
Additionally, the Hall current sensor in the present invention has larger analog output signal, without the need for loaded down with trivial details differential amplification
Processing Jing simple buffering with bandpass filtering etc. and being sent directly into single-chip microcomputer after filtering carries out A/D conversions, is saving system
Current detection accuracy is improve while system cost.
Specifically, detection means of the invention can be applied to the small and special electric machines such as automobile rearview mirror detection occasion.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in
Particular implementation is stated, those skilled in the art can make various modifications or modification within the scope of the claims,
This has no effect on the flesh and blood of the present invention.
Claims (9)
1. it is a kind of with the Gain Automatic current sensing means adjusted with telecommunications functions, it is characterised in that to include：
Current circuit, automatic gain adjusting circuit, radio communication circuit and single chip circuit, the current circuit respectively with from
Dynamic gain adjusting circuit, single chip circuit are connected, and the automatic gain adjusting circuit is connected with single chip circuit, the list
Piece electromechanics road is connected with radio communication circuit and can realize telecommunication and intelligent node function；
- the current circuit, for detecting the electric current and voltage signal of access device, wherein, the electric current side that will be detected
Single chip circuit is delivered to signal, the voltage signal for detecting is delivered to into automatic gain adjusting circuit；
- the automatic gain adjusting circuit, for gain-adjusted is carried out to the current circuit input voltage signal, and will
Represent current values size signal be amplified after be delivered to single chip circuit；
- the single chip circuit, for controlling the break-make of the current circuit, and by current circuit, automatic gain control
The current direction signal of circuit input, current values signal are encoded after A/D conversions, obtain encoded signal, will
The encoded signal feed-in radio communication circuit；
- the radio communication circuit, for the encoded signal of single chip circuit is sent to remote master computer, realizes
Internet of Things intelligent node function.
2. according to claim 1 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, the current circuit includes：Joint J1, joint J2, relay K1, fly-wheel diode V1, audion
Q1, resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, Hall current sensor U1 and comparator chip
U2；Wherein, the first pin P1 of joint J1, the first pin P2 are connected to the first of the Hall current sensor U1
The second input pin IN2 of input pin IN1, the Hall current sensor U1 is connected to the COM of relay K1 and draws
Foot, the pin GND ground connection of the Hall current sensor U1, the pin VCC connections of the Hall current sensor U1
Power supply VCC, and the pin VCC of the Hall current sensor U1 is also connected to the Hall current biography by electric capacity C1
The pin GND of sensor U1, the output pin OUT of the Hall current sensor U1 are connected to the automatic gain control
Circuit, the output pin OUT1 of the Hall current sensor U1, pin OUT2 are respectively connecting to single chip circuit；Institute
The negative pole for stating fly-wheel diode V1 is connected to second coil port L2 of power supply VCC, relay K1, two pole of the afterflow
The positive pole of pipe V1 is connected to the colelctor electrode of the first coil port L1 and audion Q1 of the relay K1, three pole
The grounded emitter of pipe Q1, the base stage of the audion Q1 are drawn by the output that resistance R1 is connected to comparator chip U2
The base stage of foot OUT, the audion Q1 is also connected with one end of resistance R2, and the other end of the resistance R2 is connected to monolithic
Electromechanical road；The NO ports of the relay K1 are connected to the first pin P1 and the first pin P2 of joint J2；The ratio
Positive input pin IN+ compared with device chip U2 is connected to the NO ports of the relay K1, the comparator chip U2's
Negative input pin IN-, pin VSS, pin GND are grounded, and the pin VDD of the comparator chip U2 is connected to electricity
Source VCC is simultaneously grounded by electric capacity C2, and the output pin OUT of the comparator chip U2 is connected to electricity by resistance R3
Source VCC.
3. according to claim 2 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, the automatic gain adjusting circuit includes：Electric capacity C3, electric capacity C4, electric capacity C5, resistance R4, resistance R5,
Resistance R6, high accuracy integrated transporting discharging U3 and digital regulation resistance U4, one end of wherein resistance R4 is connected in current circuit
The Hall current sensor U1 output pin OUT, the other end of the resistance R4 is connected to the high accuracy collection
Into the positive input pin IN+ of amplifier U3, the negative input pin IN- of the high accuracy integrated transporting discharging U3 is connected to digital electricity
The pin W of the pin H of position device U4, the digital regulation resistance U4 is connected to the output of the high accuracy integrated transporting discharging U3 and draws
The pin VDD of foot OA, the digital regulation resistance U4 is connected to power supply VCC and is grounded by electric capacity C4；The high accuracy
The positive voltage pin V+ of integrated transporting discharging U3 is connected to power supply VCC and is grounded by electric capacity C3, the high accuracy integrated transporting discharging
The negative voltage pin V- ground connection of U3；The output pin OA of the high accuracy integrated transporting discharging U3 is connected to one end of resistance R6,
The other end of the resistance R6 is connected to single chip circuit and is grounded by electric capacity C5, and the digital regulation resistance U4's draws
Foot GND is grounded, and the CS pins of the digital regulation resistance U4, UD pins are connected to single chip circuit.
4. according to claim 3 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, the radio communication circuit includes：Electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, less radio-frequency core
Piece U5, resistance R8 and crystal oscillator X1, wherein, the pin SDI of the radio frequency chip U5, pin SCK, pin SS,
Pin IRQ, pin FSK are connected to single chip circuit, and the pin VSS ground connection of the radio frequency chip U5 is described
The pin VDD of radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C6；The radio frequency chip U5
Pin MOD be connected to one end of resistance R8, the other end of the resistance R8 is connected to power supply VCC and by electric capacity C7
Ground connection；The pin RFP of the radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C8, described wireless
The pin RFN of radio frequency chip U5 is connected to power supply VCC and is grounded by electric capacity C9, the radio frequency chip U5's
Pin XTL is grounded by crystal oscillator X1.
5. according to claim 4 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, single chip circuit includes：Single-chip microcomputer U6 and electric capacity C11, wherein, the pin VDD of the single-chip microcomputer U6
It is connected to power supply VCC and is grounded by electric capacity C11, the pin IRQ of the single-chip microcomputer U6 is connected to radio communication circuit
In radio frequency chip U5 pin IRQ, the pin SCL of the single-chip microcomputer U6 is connected in radio communication circuit
The pin FSK of radio frequency chip U5, the pin SS of the single-chip microcomputer U6 are connected to wirelessly penetrating in radio communication circuit
The pin MOSI of the pin SS of frequency chip U5, single-chip microcomputer U6 is connected to the radio frequency chip U5 in radio communication circuit
Pin SDI, the pin SCK of single-chip microcomputer U6 is connected to the pin SCK of the radio frequency chip U5 in radio communication circuit；
The pin VSS ground connection of the single-chip microcomputer U6, the pin PTA0 of the single-chip microcomputer U6 is connected to described in current circuit
The pin PTA1 of the pin OUT1 of Hall current sensor U1, the single-chip microcomputer U6 is connected to described in current circuit
The pin PTA2 of the pin OUT2 of Hall current sensor U1, the single-chip microcomputer U6 is connected to described in current circuit
The other end of resistance R2, the pin PTA3 of the single-chip microcomputer U6 are connected to the Hall current sensing in current circuit
The pin PTA3 of the pin OUT1 of device U1, the single-chip microcomputer U6 is connected to the numeral in automatic gain adjusting circuit
The pin PTB0 of the pin CS of potentiometer U4, the single-chip microcomputer U6 is connected to the number in automatic gain adjusting circuit
The pin U/D of word potentiometer U4；The pin ADP5 of the single-chip microcomputer U6 is connected to described in automatic gain adjusting circuit
The other end of resistance R6.
6. according to claim 2 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, described relay K1, using HK4100F-DC5V-SHG relays；Described fly-wheel diode V1,
Using IN4007 diodes；Described audion Q1, using S9013 audions；Described Hall current sensor U1,
Using THS-65 Hall current sensors；Described comparator chip U2, using LM311 chips.
7. according to claim 3 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, the high accuracy integrated transporting discharging U3 adopts OP196 high accuracy integrated transporting discharging chips；Described digital current potential
Device U4 adopts CAT5120 chips.
8. according to claim 4 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, described radio frequency chip U5 adopts SI4020 chips.
9. according to claim 5 with the Gain Automatic current sensing means adjusted with telecommunications functions, its
It is characterised by, described single-chip microcomputer U6 adopts MC9S08SH8 single-chip microcomputers.
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