CN107918331A - A kind of passive Rousers of RS485 and method of the isolation of low-power consumption band - Google Patents
A kind of passive Rousers of RS485 and method of the isolation of low-power consumption band Download PDFInfo
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- CN107918331A CN107918331A CN201711434703.5A CN201711434703A CN107918331A CN 107918331 A CN107918331 A CN 107918331A CN 201711434703 A CN201711434703 A CN 201711434703A CN 107918331 A CN107918331 A CN 107918331A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/23—Pc programming
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The present invention provides a kind of passive Rousers of RS485 of low-power consumption band isolation; including RS485 host computers, RS485 band isolation wake-up circuit, RS485 band isolating interfaces circuit, MCU mainboards and sensor power of the whole machine, RS485 band isolation wake-up circuits include isolated location, protection location, sampling unit, detection unit and filter unit；RS485 host computers port A and port B is connected with isolated location and RS485 band isolating interface circuits; isolated location is connected with protection location and sampling unit; protection location is connected to port A; detection unit is connected with sampling unit, filter unit and sensor power of the whole machine; MCU mainboards are connected with filter unit, RS485 band isolating interface circuits and sensor power of the whole machine, and sensor power of the whole machine is connected to RS485 band isolating interface circuits.The present invention also provides a kind of passive awakening methods of RS485 of low-power consumption band isolation, effectively reduce overall stand-by power consumption.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of passive Rousers of RS485 of low-power consumption band isolation and
Method.
Background technology
With the development of technology, sensor is more and more in the use of environment measuring, Internet of Things and robot technology；Very
Sensor is all using battery powered when more, since the restriction of battery technology prevents standby/working time from effectively being lifted.
Requirement at this time to product power consumption is higher and higher, and stand-by power consumption is more low better.It is and critically important in industrial sensor access interface
One be RS485 communications, and be all interruption/timing operation since present sensor is mostly super low-power consumption, it is minimum to ensure
Power-consumption standby generally all uses active awakening mode, i.e., is carried out using Timer modes.Active awakening mode is real-time for some
Property is more demanding, it is necessary to which the exterior demand that is controlled is just more awkward.Since it is desired that exterior control, then RS485 needs
Standby for a long time, the stand-by power consumption of most of isolation RS 485 chip milliampere level is just very for sensor Overall Power Consumption
It is big, seriously affect stand-by time.
The content of the invention
One of the technical problem to be solved in the present invention, is that providing a kind of RS485 of low-power consumption band isolation passively wakes up dress
Put, triggered using the RS485 band isolation wake-up circuits of a low-power consumption, RS485 band isolating interface circuits directly power off reduction
Power consumption, so as to extend the stand-by time of sensor complete machine；Isolation causes with protection technique, special start/triggering command at the same time
The anti-interference of circuit is stronger.
One of the problem of of the invention, be realized in：
A kind of passive Rousers of RS485 of low-power consumption band isolation, including RS485 host computers, RS485 band isolation wake up electricity
Road, RS485 bands isolating interface circuit, MCU mainboards and sensor power of the whole machine, the RS485 bands isolation wake-up circuit include every
From unit, protection location, sampling unit, detection unit and filter unit；Port A and port the B difference of the RS485 host computers
Be connected with two input terminals of two input terminals and RS485 with isolating interface circuit of isolated location, the isolated location respectively with guarantor
Unit and sampling unit connection are protected, the protection location is additionally coupled to the port A of RS485 host computers, the detection unit difference
It is connected with sampling unit, filter unit and sensor power of the whole machine, the MCU mainboards are isolated with filter unit, RS485 bands respectively
Interface circuit and the connection of sensor power of the whole machine, the sensor power of the whole machine are additionally coupled to RS485 band isolating interface circuits.
Further, the isolated location includes capacitance C1 and capacitance C2, the two-way TVS diode T1 of protection location,
The model PESD3V3L2BT of the two-way TVS diode T1, the sampling unit include resistance R1, capacitance C3 and resistance R2,
The detection unit includes resistance R3, resistance R4, resistance R5, resistance R6, capacitance C4 and comparator U1, the type of the comparator U1
Number it is TS881ILT, the filter unit includes diode D1, resistance R7 and capacitance C5；
One end of the capacitance C1 and one end of capacitance C2 are connected respectively to the port A of RS485 host computers and port
The first pin of B, the two-way TVS diode T1 respectively with the port A of RS485 host computers, the other end of capacitance C1, resistance R1
One end, capacitance C3 one end and resistance R2 one end connection, the second pin of the two-way TVS diode T1 is hanging, described
The 3rd pin of two-way TVS diode T1, the other end of capacitance C2, the other end ground connection of the other end of resistance R1 and capacitance C3；
One end connection of the other end and resistance R3 of the 3rd pin difference resistance R2 of the comparator U1, the first of the comparator U1
Pin is connected with the other end of resistance R3 and the cathode of diode D1 respectively, the 4th pin of the comparator U1 respectively with resistance
One end of R4 and the connection of one end of resistance R5, the 5th pin of the comparator U1 respectively with one end of resistance R6 and capacitance C4
One end connects, and the other end of resistance R4 and the other end of resistance R6 are connected to sensor power of the whole machine, and the of the comparator U1
The other end of two pins, the other end of resistance R5 and capacitance C4 is grounded；The anode of the diode D1 and one end of resistance R7
Connection, the other end of the resistance R7 are connected with one end of capacitance C5 and MCU mainboards respectively, another termination of the capacitance C5
Ground.
Further, the RS485 includes the RS485 transceivers U2 with isolation, resistance R8, resistance with isolating interface circuit
R9, resistance R10, capacitance C6 and capacitance C7, the model ADM2483 of the RS485 transceivers U2；
The 12nd pin of the RS485 transceivers U2 is respectively on one end with resistance R8, one end of resistance R9 and RS485
The port A connections of position machine, the other end of resistance R8 are connected to sensor power of the whole machine, and the 13rd of the RS485 transceivers U2 the
The port B of the pin other end with resistance R9, one end of resistance R10 and RS485 host computers respectively is connected, and resistance R10's is another
End ground connection；The tenth pin of the RS485 transceivers U2, the 11st pin and the 14th pin are hanging；The RS485 transceivers
The 8th pin, second pin, the 9th pin and the 15th pin ground connection of U2；The 7th pin of the RS485 transceivers U2,
Six pins, the 5th pin, the 4th pin and the 3rd pin are respectively connected to the corresponding port of MCU mainboards；The RS485 transceivers
The first pin and the 16th pin of U2 is connected to sensor power of the whole machine；One end of the capacitance C6 and one end of capacitance C7 connect
It is connected to sensor power of the whole machine, the other end of the capacitance C6 and the other end ground connection of capacitance C7.
Further, further include protection circuit, the both ends of the protection circuit be parallel to RS485 host computers port A and
Port B.
The second technical problem to be solved by the present invention, is that providing a kind of RS485 of low-power consumption band isolation passively wakes up dress
Put, triggered using the RS485 band isolation wake-up circuits of a low-power consumption, RS485 band isolating interface circuits directly power off reduction
Power consumption, so as to extend the stand-by time of sensor complete machine；Isolation causes with protection technique, special start/triggering command at the same time
The anti-interference of circuit is stronger.
The two of the problem of of the invention, are realized in：
A kind of passive awakening methods of RS485 of low-power consumption band isolation, the method need to provide a kind of above-mentioned low-power consumption band
The passive Rousers of RS485 of isolation, the method specifically comprise the following steps：
Step 1, the RS485 host computers send triggering command and change awake circuit to RS485 band isolation；Meanwhile the RS485
Host computer also transmission level signal gives RS485 band isolating interface circuits, for RS485 band isolating interface circuits into row data communication；
Step 2, the triggering command change in awake circuit in RS485 band isolation and triggering command are carried out by isolated location
Coupling and isolation, are protected by protection location, after then acquired unit is acquired, by being exported after detection unit detection
To filter unit, after being filtered by filter unit, triggering command is finally defeated by the MCU mainboards of resting state；
Step 3, by the MCU mainboards identify whether the triggering command meets trigger condition, if so, then MCU mainboards control
Sensor power of the whole machine processed is opened, and enters step 4；If it is not, then sensor power of the whole machine is closed；
Step 4, the sensor power of the whole machine provide power supply, the RS485 bands isolation to RS485 band isolating interface circuits
Interface circuit is started to work, so that sensor is run, sensor is realized and MCU master by RS485 band isolating interface circuits
Data interaction between plate.
Further, the step 2 is specially：
The triggering command changes in awake circuit in RS485 band isolation and trigger signal is carried out by capacitance C1 and capacitance C2
Isolation, is protected by two-way TVS diode T1, and after resistance R1, capacitance C3 and resistance R2 gather signal, triggering command is through electricity
Resistance R2 is input to comparator U1 and carrys out detection, and current limliting is carried out by resistance R3, and partial pressure is carried out by resistance R4 and resistance R5, and by resistance
After R6 and capacitance C4 is filtered, is exported from the output terminal of comparator U1 and give diode D1, then by diode D1, resistance R7 and electricity
After appearance C5 is filtered, the MCU mainboards of triggering command final output to resting state.
The advantage of the invention is that：Electricity is waken up from RS485 host computers output trigger signal (instruction) to RS485 band isolation
Road, isolates trigger signal by two capacitances (capacitance C1 and capacitance C2), by two-way TVS diode T1
(PESD3V3L2BT) protected, through resistance R1, capacitance C3 and resistance R2 gather signal after by it is rail-to-rail (can be output,
Can also be input) na level power consumption (low-power consumption) comparator (TS881ILT) come detection output, after filtering unit filters,
Trigger signal final output identifies whether trigger signal (instruction) meets bar to the MCU mainboards of low power consumption standby by MCU mainboards
Part, if just control sensor power of the whole machine is opened, provides power supply, so that sensor to RS485 band isolating interface circuits
Operation.The passive Rousers of the RS485 have isolation features, and can effectively reduce entirety of the RS485 with isolation wake-up circuit
Power consumption, highest baud rate is up to 460800bps.
Brief description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is a kind of structure diagram of the passive Rousers of RS485 of low-power consumption band isolation of the present invention.
Fig. 2 is structure diagrams of the RS485 with isolation wake-up circuit in the present invention.
Fig. 3 is the principle of the present invention block diagram.
Fig. 4 is the control flow chart of the present invention.
Fig. 5 is the analogous diagram of the present invention.
Fig. 6 a are the schematic diagram that baud rate is 1200bps in actually measured waveform.
Fig. 6 b are the schematic diagram that baud rate is 115200bps in actually measured waveform.
Fig. 6 c are the schematic diagram that baud rate is 460800bps in actually measured waveform.
Embodiment
The present invention is made with reference to specific embodiment and further being described in detail, but the present invention structure and not only limit
In following embodiments.
Please refer to Fig.1 with shown in Fig. 2, a kind of low-power consumption band of the invention isolation the passive Rousers of RS485, including
RS485 host computers, RS485 band isolation wake-up circuit, RS485 band isolating interfaces circuit, MCU mainboards and sensor power of the whole machine,
The RS485 bands isolation wake-up circuit includes isolated location, protection location, sampling unit, detection unit and filter unit；It is described
The port A and port B of RS485 host computers are defeated with two input terminals and RS485 two with isolating interface circuit of isolated location respectively
Enter end connection, i.e., the port A and port B of described RS485 host computers are connected respectively in isolation list by two main RS485 buses
Two input terminals of member, the port A and port B of the RS485 host computers also by two secondary RS485 buses be connected respectively in
Two input terminals (the two secondary RS485 bus be connected to two main RS485 buses) of the RS485 with isolating interface circuit, port A and port
B is bidirectional interface, realizes that RS485 host computers isolate wake-up circuit, RS485 host computers and RS485 band isolating interfaces with RS485 bands
The data interaction of circuit；The isolated location is connected with protection location and sampling unit respectively, and the protection location is additionally coupled to
The port A of RS485 host computers, the detection unit are connected with sampling unit, filter unit and sensor power of the whole machine respectively, institute
State MCU mainboards to be connected with filter unit, RS485 band isolating interface circuits and sensor power of the whole machine respectively, the sensor is whole
Electromechanical source is additionally coupled to RS485 band isolating interface circuits.
Specifically, in RS485 band isolation wake-up circuits：
The isolated location includes capacitance C1 and capacitance C2, the two-way TVS diode T1 of protection location, described two-way
The model PESD3V3L2BT of TVS diode T1, the sampling unit include resistance R1, capacitance C3 and resistance R2, the detection
Unit includes resistance R3, resistance R4, resistance R5, resistance R6, capacitance C4 and comparator U1, the model of the comparator U1
TS881ILT, the filter unit include diode D1, resistance R7 and capacitance C5；
One end of the capacitance C1 and one end of capacitance C2 are connected respectively to the port A of RS485 host computers and port
The first pin of B, the two-way TVS diode T1 respectively with the port A of RS485 host computers, the other end of capacitance C1, resistance R1
One end, capacitance C3 one end and resistance R2 one end connection, the second pin of the two-way TVS diode T1 is hanging, described
The 3rd pin of two-way TVS diode T1, the other end of capacitance C2, the other end ground connection of the other end of resistance R1 and capacitance C3；
One end connection of the other end and resistance R3 of the 3rd pin difference resistance R2 of the comparator U1, the first of the comparator U1
Pin is connected with the other end of resistance R3 and the cathode of diode D1 respectively, the 4th pin of the comparator U1 respectively with resistance
One end of R4 and the connection of one end of resistance R5, the 5th pin of the comparator U1 respectively with one end of resistance R6 and capacitance C4
One end connects, and the other end of resistance R4 and the other end of resistance R6 are connected to sensor power of the whole machine, and the of the comparator U1
The other end of two pins, the other end of resistance R5 and capacitance C4 is grounded；The anode of the diode D1 and one end of resistance R7
Connection, the other end of the resistance R7 are connected with one end of capacitance C5 and MCU mainboards respectively, another termination of the capacitance C5
Ground.
Specifically, in RS485 band isolating interface circuits：
The RS485 includes the RS485 transceivers U2 with isolation, resistance R8, resistance R9, resistance with isolating interface circuit
R10, capacitance C6 and capacitance C7, the model ADM2483 of the RS485 transceivers U2；
The 12nd pin of the RS485 transceivers U2 is respectively on one end with resistance R8, one end of resistance R9 and RS485
The port A connections of position machine, the other end of resistance R8 are connected to sensor power of the whole machine, and the 13rd of the RS485 transceivers U2 the
The port B of the pin other end with resistance R9, one end of resistance R10 and RS485 host computers respectively is connected, and resistance R10's is another
End ground connection；The tenth pin of the RS485 transceivers U2, the 11st pin and the 14th pin are hanging；The RS485 transceivers
The 8th pin, second pin, the 9th pin and the 15th pin ground connection of U2；The 7th pin of the RS485 transceivers U2,
Six pins, the 5th pin, the 4th pin and the 3rd pin are respectively connected to the corresponding port of MCU mainboards；The RS485 transceivers
The first pin and the 16th pin of U2 is connected to sensor power of the whole machine；One end of the capacitance C6 and one end of capacitance C7 connect
It is connected to sensor power of the whole machine, the other end of the capacitance C6 and the other end ground connection of capacitance C7.
Specifically, protection circuit is further included, the both ends of the protection circuit are parallel to port A and the end of RS485 host computers
Mouth B；The whole passive Rousers of RS485 of protection can be played the role of with lightning protection, antistatic.
As shown in Figure 3 and Figure 4, a kind of passive awakening methods of RS485 of low-power consumption band of the invention isolation, the method need
A kind of passive Rousers of RS485 of above-mentioned low-power consumption band isolation are provided, the method specifically comprises the following steps：
Step 1, the RS485 host computers send triggering command and change awake circuit to RS485 band isolation, by RS485 host computers
The triggering command (signal) sent, so that RS485 is not easy the interference by other signals and false triggering with isolation wake-up circuit；
Step 2, the triggering command change in awake circuit in RS485 band isolation and triggering command are carried out by isolated location
Coupling and isolation, are protected by protection location, after then acquired unit is acquired, by being exported after detection unit detection
To filter unit, after being filtered by filter unit, triggering command is finally defeated by the MCU mainboards of resting state (holding state)；
Wherein, it is specially：
The triggering command changes in awake circuit in RS485 band isolation and trigger signal is carried out by capacitance C1 and capacitance C2
Isolation, is protected by two-way TVS diode T1 (PESD3V3L2BT), and signal is gathered through resistance R1, capacitance C3 and resistance R2
Afterwards, triggering command is input to comparator U1 (TS881ILT) through resistance R2 and carrys out detection, carries out current limliting by resistance R3, passes through resistance R4
Partial pressure is carried out with resistance R5, and after being filtered by resistance R6 and capacitance C4, is exported from the output terminal of comparator U1 to diode
D1, then after being filtered by diode D1, resistance R7 and capacitance C5, the MCU mainboards of triggering command final output to resting state
(power consumption is about 10uA)；
Step 3, by the MCU mainboards identify whether the triggering command meets trigger condition, if so, then MCU mainboards control
Sensor power of the whole machine processed is opened, and enters step 4；If it is not, then sensor power of the whole machine is closed；
Step 4, the sensor power of the whole machine provide power supply, the RS485 bands isolation to RS485 band isolating interface circuits
Interface circuit start to work so that sensor operation (isolating interface circuit is the interface of sensor), by RS485 bands every
The data communication between sensor, RS485 host computers and MCU mainboards is realized from interface circuit.
MCU mainboards, sensor power of the whole machine and RS485 band isolating interface circuits are all not gated on, are in when not waking up
Dormancy holding state, is just also at closed mode, Overall Power Consumption is very low by RS485 with the sensor that isolating interface circuit controls；
When RS485 band isolation wake-up circuit transmission trigger signals give MCU mainboards, MCU main board works, control sensor power of the whole machine opens
It is dynamic, power supply is provided to RS485 band isolating interface circuits, RS485 band isolating interface circuits are opened, so that sensor is run；
Purposes of the RS485 with isolation wake-up circuit be in order to open power supplys of the RS485 with isolating interface circuit, then realize sensor,
The normal communication of RS485 host computers and MCU mainboards, RS485 band isolating interface circuits are conductive channel.
Fig. 5 is the analogous diagram of the passive Rousers of the RS485, from the point of view of the waveform simulated using Multisim, RS485's
Input waveform passes through a series of processing, the detection of comparator etc., can preferably reduce former input waveform.The waveform of Fig. 5 is
The waveform of (it is 115200 to simulate baud rate) in the case where incoming frequency is 120KHz.
As shown in Fig. 6 a to 6c, in actually measured waveform, the circuit device is from 1200bps to 460800bps after tested
Trigger signal can correct reliable delivery.
For Overall Power Consumption：(see Tables 1 and 2)
Table 1：Theory and technology power consumption：
Table 2：Actual techniques power consumption：
| Input voltage (V) | Actual test electric current | Actual power consumption |
| 3.3 | 0.7uA | 2.31uW |
In conclusion advantages of the present invention is as follows：
1st, the passive Rousers of the RS485 have isolation features；
2nd, the passive Rousers of the RS485 can effectively reduce overall powers of the RS485 with isolation wake-up circuit；
3rd, the highest baud rate of the passive Rousers of the RS485 is up to 460800bps.
Although the foregoing describing the embodiment of the present invention, those familiar with the art should manage
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, are familiar with this
The equivalent modification and change that the technical staff in field is made in the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (6)
1. a kind of passive Rousers of RS485 of low-power consumption band isolation, including RS485 host computers, RS485 band isolation wake up electricity
Road, RS485 band isolating interfaces circuit, MCU mainboards and sensor power of the whole machine, it is characterised in that：The RS485 bands isolation wakes up
Circuit includes isolated location, protection location, sampling unit, detection unit and filter unit；The port A of the RS485 host computers
It is connected respectively with two input terminals of two input terminals and RS485 with isolating interface circuit of isolated location with port B, the isolation is single
Member is connected with protection location and sampling unit respectively, and the protection location is additionally coupled to the port A of RS485 host computers, the inspection
Ripple unit is connected with sampling unit, filter unit and sensor power of the whole machine respectively, the MCU mainboards respectively with filter unit,
RS485 band isolating interface circuits and sensor power of the whole machine connect, and the sensor power of the whole machine is additionally coupled to RS485 band isolation
Interface circuit.
2. a kind of low-power consumption band as claimed in claim 1 and the passive Rousers of RS485 of isolation, it is characterised in that：It is described
Isolated location includes capacitance C1 and capacitance C2, the two-way TVS diode T1 of protection location, the two-way TVS diode T1's
Model PESD3V3L2BT, the sampling unit include resistance R1, capacitance C3 and resistance R2, and the detection unit includes resistance
R3, resistance R4, resistance R5, resistance R6, the model TS881ILT of capacitance C4 and comparator U1, the comparator U1, the filter
Ripple unit includes diode D1, resistance R7 and capacitance C5；
One end of the capacitance C1 and one end of capacitance C2 are connected respectively to the port A of RS485 host computers and port B, institute
State the first pin of two-way TVS diode T1 respectively with the port A of RS485 host computers, the other end of capacitance C1, resistance R1 one
One end connection at end, one end of capacitance C3 and resistance R2, the second pin of the two-way TVS diode T1 is hanging, described two-way
The 3rd pin of TVS diode T1, the other end of capacitance C2, the other end ground connection of the other end of resistance R1 and capacitance C3；It is described
One end connection of the other end and resistance R3 of the 3rd pin difference resistance R2 of comparator U1, the first pin of the comparator U1
It is connected respectively with the other end of resistance R3 and the cathode of diode D1, the 4th pin of the comparator U1 is respectively with resistance R4's
One end and the connection of one end of resistance R5, the 5th pin of the comparator U1 respectively with one end of resistance R6 and one end of capacitance C4
Connection, the other end of resistance R4 and the other end of resistance R6 are connected to sensor power of the whole machine, and the second of the comparator U1 draws
The other end of foot, the other end of resistance R5 and capacitance C4 is grounded；The anode of the diode D1 is connected with one end of resistance R7,
The other end of the resistance R7 is connected with one end of capacitance C5 and MCU mainboards respectively, the other end ground connection of the capacitance C5.
3. a kind of low-power consumption band as claimed in claim 1 and the passive Rousers of RS485 of isolation, it is characterised in that：It is described
RS485 includes RS485 transceivers U2, resistance R8, resistance R9, resistance R10, capacitance C6 and electricity with isolation with isolating interface circuit
Hold C7, the model ADM2483 of the RS485 transceivers U2；
The 12nd pin of the RS485 transceivers U2 one end with resistance R8, one end of resistance R9 and RS485 host computers respectively
Port A connections, the other end of resistance R8 is connected to sensor power of the whole machine, the 13rd pin of the RS485 transceivers U2
The port B of the other end with resistance R9, one end of resistance R10 and RS485 host computers is connected respectively, another termination of resistance R10
Ground；The tenth pin of the RS485 transceivers U2, the 11st pin and the 14th pin are hanging；The RS485 transceivers U2's
8th pin, second pin, the 9th pin and the 15th pin ground connection；The 7th pin of the RS485 transceivers U2, the 6th draw
Foot, the 5th pin, the 4th pin and the 3rd pin are respectively connected to the corresponding port of MCU mainboards；The RS485 transceivers U2's
First pin and the 16th pin are connected to sensor power of the whole machine；One end of the capacitance C6 and one end of capacitance C7 are connected to
Sensor power of the whole machine, the other end of the capacitance C6 and the other end ground connection of capacitance C7.
4. a kind of low-power consumption band as claimed in claim 1 and the passive Rousers of RS485 of isolation, it is characterised in that：Also wrap
Protection circuit is included, the both ends of the protection circuit are parallel to the port A and port B of RS485 host computers.
A kind of 5. passive awakening methods of RS485 of low-power consumption band isolation, it is characterised in that：The method need to be provided such as claim
A kind of passive Rousers of RS485 of low-power consumption band isolation described in 1, the method specifically comprise the following steps：
Step 1, the RS485 host computers send triggering command and change awake circuit to RS485 band isolation；Meanwhile the RS485 is upper
Machine also transmission level signal gives RS485 band isolating interface circuits, for RS485 band isolating interface circuits into row data communication；
Step 2, the triggering command change in awake circuit in RS485 band isolation and triggering command are coupled by isolated location
And isolation, protected by protection location, after then acquired unit is acquired, by being exported after detection unit detection to filter
Ripple unit, after being filtered by filter unit, triggering command is finally defeated by the MCU mainboards of resting state；
Step 3, by the MCU mainboards identify whether the triggering command meets trigger condition, if so, then the control of MCU mainboards passes
Sensor power of the whole machine is opened, and enters step 4；If it is not, then sensor power of the whole machine is closed；
Step 4, the sensor power of the whole machine provide power supply, the RS485 bands isolating interface to RS485 band isolating interface circuits
Circuit is started to work so that sensor is run, sensor by RS485 band isolating interface circuits realize with MCU mainboards it
Between data interaction.
6. a kind of low-power consumption band as claimed in claim 5 and the passive awakening methods of RS485 of isolation, it is characterised in that：It is described
Step 2 is specially：
The triggering command the RS485 band isolation change in awake circuit by capacitance C1 and capacitance C2 to trigger signal carry out every
From, protected by two-way TVS diode T1, through resistance R1, capacitance C3 and resistance R2 gather signal after, triggering command is through resistance
R2 is input to comparator U1 and carrys out detection, and current limliting is carried out by resistance R3, and partial pressure is carried out by resistance R4 and resistance R5, and by resistance R6
And after capacitance C4 is filtered, is exported from the output terminal of comparator U1 and give diode D1, then by diode D1, resistance R7 and capacitance
After C5 is filtered, the MCU mainboards of triggering command final output to resting state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711434703.5A CN107918331B (en) | 2017-12-26 | 2017-12-26 | Low-power-consumption RS485 passive awakening device and method with isolation |
Applications Claiming Priority (1)
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| CN117997333A (en) * | 2024-04-03 | 2024-05-07 | 宁波均联智行科技股份有限公司 | Control signal transmission circuit, vehicle-mounted electronic equipment and vehicle |
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| CN107918331B (en) | 2023-04-25 |
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