CN107918331B - Low-power-consumption RS485 passive awakening device and method with isolation - Google Patents
Low-power-consumption RS485 passive awakening device and method with isolation Download PDFInfo
- Publication number
- CN107918331B CN107918331B CN201711434703.5A CN201711434703A CN107918331B CN 107918331 B CN107918331 B CN 107918331B CN 201711434703 A CN201711434703 A CN 201711434703A CN 107918331 B CN107918331 B CN 107918331B
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- pin
- isolation
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- G05B2219/23431—Change program on detection of deviations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention provides a low-power-consumption RS485 passive wake-up device with isolation, which comprises an RS485 upper computer, an RS485 isolation wake-up circuit, an RS485 isolation interface circuit, an MCU main board and a sensor whole machine power supply, wherein the RS485 isolation wake-up circuit comprises an isolation unit, a protection unit, a sampling unit, a detection unit and a filtering unit; the port A and the port B of the RS485 upper computer are connected with an isolation unit and an RS485 band isolation interface circuit, the isolation unit is connected with a protection unit and a sampling unit, the protection unit is connected to the port A, the detection unit is connected with the sampling unit, a filtering unit and a sensor whole machine power supply, the MCU main board is connected with the filtering unit, the RS485 band isolation interface circuit and the sensor whole machine power supply, and the sensor whole machine power supply is connected to the RS485 band isolation interface circuit. The invention also provides a low-power-consumption RS485 passive wake-up method with isolation, which effectively reduces the overall standby power consumption.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a low-power-consumption RS485 passive wake-up device with isolation and a method.
Background
With the development of technology, sensors are increasingly used in environment detection, internet of things and robot technology; many times the sensor is powered by a battery, and standby/operating time cannot be effectively increased due to battery technology constraints. The requirements on the power consumption of the product are higher and higher, and the lower the standby power consumption is, the better. One important industrial sensor access interface is RS485 communication, and as the existing sensors are ultra-low power consumption and are all in intermittent/timed operation, an active wake-up mode, namely a timer mode is generally used for ensuring the minimum power consumption standby. The active wake-up mode has high real-time requirements, and the need for external control is embarrassing. Because external control is needed, the RS485 needs to be standby for a long time, and compared with the power consumption of the whole sensor, the standby power consumption of the milliamp level of the isolated RS485 chip is very large, and the standby time is seriously influenced.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide a low-power-consumption RS485 passive wake-up device, which is triggered by a low-power-consumption RS485 isolation wake-up circuit, and the RS485 isolation interface circuit is directly powered off to reduce the power consumption, so that the standby time of the whole sensor is prolonged; meanwhile, the isolation and protection technology and the special starting/triggering instruction enable the anti-interference performance of the circuit to be stronger.
One of the problems of the present invention is achieved by:
the RS485 passive wake-up device with low power consumption comprises an RS485 upper computer, an RS485 isolation wake-up circuit, an RS485 isolation interface circuit, an MCU main board and a sensor complete machine power supply, wherein the RS485 isolation wake-up circuit comprises an isolation unit, a protection unit, a sampling unit, a detection unit and a filtering unit; the port A and the port B of the RS485 upper computer are respectively connected with two input ends of an isolation unit and two input ends of an RS485 band isolation interface circuit, the isolation unit is respectively connected with a protection unit and a sampling unit, the protection unit is further connected to the port A of the RS485 upper computer, the detection unit is respectively connected with the sampling unit, a filtering unit and a sensor whole machine power supply, the MCU main board is respectively connected with the filtering unit, the RS485 band isolation interface circuit and the sensor whole machine power supply, and the sensor whole machine power supply is further connected to the RS485 band isolation interface circuit.
Further, the isolation unit includes a capacitor C1 and a capacitor C2, the protection unit is a bidirectional TVS diode T1, the bidirectional TVS diode T1 is of a type PESD3V3L2BT, the sampling unit includes a resistor R1, a capacitor C3 and a resistor R2, the detection unit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C4 and a comparator U1, the comparator U1 is of a type TS881ILT, and the filtering unit includes a diode D1, a resistor R7 and a capacitor C5;
one end of the capacitor C1 and one end of the capacitor C2 are correspondingly connected to a port A and a port B of the RS485 upper computer respectively, a first pin of the bidirectional TVS diode T1 is connected with the port A of the RS485 upper computer, the other end of the capacitor C1, one end of the resistor R1, one end of the capacitor C3 and one end of the resistor R2 respectively, a second pin of the bidirectional TVS diode T1 is suspended, and a third pin of the bidirectional TVS diode T1, the other end of the capacitor C2, the other end of the resistor R1 and the other end of the capacitor C3 are grounded; the third pin of the comparator U1 is respectively connected with the other end of the resistor R2 and one end of the resistor R3, the first pin of the comparator U1 is respectively connected with the other end of the resistor R3 and the anode of the diode D1, the fourth pin of the comparator U1 is respectively connected with one end of the resistor R4 and one end of the resistor R5, the fifth pin of the comparator U1 is respectively connected with one end of the resistor R6 and one end of the capacitor C4, the other end of the resistor R4 and the other end of the resistor R6 are connected to a power supply of the whole sensor, and the second pin of the comparator U1, the other end of the resistor R5 and the other end of the capacitor C4 are grounded; the negative pole of diode D1 is connected with one end of resistance R7, the other end of resistance R7 is connected with one end of electric capacity C5 and MCU mainboard respectively, the other end ground connection of electric capacity C5.
Further, the RS485 band isolation interface circuit comprises an RS485 transceiver U2 with isolation, a resistor R8, a resistor R9, a resistor R10, a capacitor C6 and a capacitor C7, wherein the model of the RS485 transceiver U2 is ADM2483;
the twelfth pin of the RS485 transceiver U2 is respectively connected with one end of a resistor R8, one end of a resistor R9 and a port A of an RS485 upper computer, the other end of the resistor R8 is connected to a power supply of the whole sensor, the thirteenth pin of the RS485 transceiver U2 is respectively connected with the other end of the resistor R9, one end of a resistor R10 and a port B of the RS485 upper computer, and the other end of the resistor R10 is grounded; the tenth pin, the eleventh pin and the fourteenth pin of the RS485 transceiver U2 are suspended; the eighth pin, the second pin, the ninth pin and the fifteenth pin of the RS485 transceiver U2 are grounded; the seventh pin, the sixth pin, the fifth pin, the fourth pin and the third pin of the RS485 transceiver U2 are respectively connected to ports corresponding to the MCU main board; the first pin and the sixteenth pin of the RS485 transceiver U2 are connected to a power supply of the sensor whole machine; one end of the capacitor C6 and one end of the capacitor C7 are connected to a power supply of the whole sensor, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
Further, the device also comprises a protection circuit, wherein two ends of the protection circuit are connected in parallel with a port A and a port B of the RS485 upper computer.
The second technical problem to be solved by the invention is to provide a low-power-consumption RS485 passive wake-up device, which is triggered by a low-power-consumption RS485 isolation wake-up circuit, and the RS485 isolation interface circuit is directly powered off to reduce the power consumption, so that the standby time of the whole sensor is prolonged; meanwhile, the isolation and protection technology and the special starting/triggering instruction enable the anti-interference performance of the circuit to be stronger.
The second problem of the present invention is achieved by:
the method for passively waking up the RS485 with the isolation with the low power consumption needs to provide the low power consumption passively waking up device with the isolation RS485, and specifically comprises the following steps:
and 4, the power supply of the whole sensor supplies power to the RS485 band isolation interface circuit, and the RS485 band isolation interface circuit starts to work, so that the sensor operates, and the sensor realizes data interaction with the MCU main board through the RS485 band isolation interface circuit.
Further, the step 2 specifically includes:
the trigger instruction is isolated from the RS485 band isolation and wake-up circuit through a capacitor C1 and a capacitor C2, is protected by a bidirectional TVS diode T1, is input to a comparator U1 through a resistor R2 to detect after signals are acquired through a resistor R1, a capacitor C3 and a resistor R2, is limited by a resistor R3, is divided by a resistor R4 and a resistor R5, is filtered by a resistor R6 and a capacitor C4, is output to a diode D1 from the output end of the comparator U1, is filtered by a diode D1, a resistor R7 and a capacitor C5, and is finally output to an MCU motherboard in a dormant state.
The invention has the advantages that: the method comprises the steps of outputting a trigger signal (instruction) to an RS485 band isolation wake-up circuit from an RS485 upper computer, isolating the trigger signal through two capacitors (a capacitor C1 and a capacitor C2), protecting the trigger signal by a bidirectional TVS diode T1 (a PESD3V3L2 BT), collecting signals through a resistor R1, a capacitor C3 and a resistor R2, detecting and outputting the signals through a rail-to-rail (output or input) nano-level power consumption (low power consumption) comparator (TS 881 ILT), filtering the signals by a filtering unit, finally outputting the trigger signal to an MCU mainboard with micro power consumption standby, identifying whether the trigger signal (instruction) meets the condition through the MCU mainboard, and if so, controlling the power supply of the whole sensor to be started, and providing power supply for the RS485 band isolation interface circuit, thereby enabling the sensor to operate. The RS485 passive wake-up device has an isolation function, and can effectively reduce the overall power consumption of the RS485 band isolation wake-up circuit, and the highest baud rate can reach 460800bps.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an RS485 passive wake-up device with isolation in low power consumption.
Fig. 2 is a schematic diagram of an RS485 band isolation wake-up circuit in the present invention.
Fig. 3 is a functional block diagram of the present invention.
Fig. 4 is a control flow chart of the present invention.
Fig. 5 is a simulation diagram of the present invention.
FIG. 6a is a diagram showing the baud rate of 1200bps in an actual measured waveform.
FIG. 6b is a diagram showing the baud rate of 115200bps in the actual waveform.
FIG. 6c is a diagram showing the baud rate of 460800bps in the actual waveform.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the structure of the present invention is not limited to the following examples.
Referring to fig. 1 and 2, the low-power-consumption RS485 passive wake-up device with isolation comprises an RS485 upper computer, an RS485 isolation wake-up circuit, an RS485 isolation interface circuit, an MCU main board and a sensor complete machine power supply, wherein the RS485 isolation wake-up circuit comprises an isolation unit, a protection unit, a sampling unit, a detection unit and a filtering unit; the port A and the port B of the RS485 upper computer are respectively connected with two input ends of the isolation unit and two input ends of the RS485 band isolation interface circuit, namely the port A and the port B of the RS485 upper computer are respectively and correspondingly connected with two input ends of the isolation unit through two main RS485 buses, the port A and the port B of the RS485 upper computer are also respectively and correspondingly connected with two input ends of the RS485 band isolation interface circuit through two pairs of RS485 buses (the two pairs of RS485 buses are connected with the two main RS485 buses), and the port A and the port B are bidirectional interfaces, so that data interaction between the RS485 upper computer and the RS485 band isolation wake-up circuit and data interaction between the RS485 upper computer and the RS485 band isolation interface circuit are realized; the isolation unit is respectively connected with the protection unit and the sampling unit, the protection unit is also connected to a port A of the RS485 upper computer, the detection unit is respectively connected with the sampling unit, the filtering unit and the sensor whole machine power supply, the MCU main board is respectively connected with the filtering unit, the RS485 belt isolation interface circuit and the sensor whole machine power supply, and the sensor whole machine power supply is also connected to the RS485 belt isolation interface circuit.
Specifically, in the RS485 band isolation wakeup circuit:
the isolation unit comprises a capacitor C1 and a capacitor C2, the protection unit comprises a bidirectional TVS diode T1, the model of the bidirectional TVS diode T1 is PESD3V3L2BT, the sampling unit comprises a resistor R1, a capacitor C3 and a resistor R2, the detection unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C4 and a comparator U1, the model of the comparator U1 is TS881ILT, and the filtering unit comprises a diode D1, a resistor R7 and a capacitor C5;
one end of the capacitor C1 and one end of the capacitor C2 are correspondingly connected to a port A and a port B of the RS485 upper computer respectively, a first pin of the bidirectional TVS diode T1 is connected with the port A of the RS485 upper computer, the other end of the capacitor C1, one end of the resistor R1, one end of the capacitor C3 and one end of the resistor R2 respectively, a second pin of the bidirectional TVS diode T1 is suspended, and a third pin of the bidirectional TVS diode T1, the other end of the capacitor C2, the other end of the resistor R1 and the other end of the capacitor C3 are grounded; the third pin of the comparator U1 is respectively connected with the other end of the resistor R2 and one end of the resistor R3, the first pin of the comparator U1 is respectively connected with the other end of the resistor R3 and the anode of the diode D1, the fourth pin of the comparator U1 is respectively connected with one end of the resistor R4 and one end of the resistor R5, the fifth pin of the comparator U1 is respectively connected with one end of the resistor R6 and one end of the capacitor C4, the other end of the resistor R4 and the other end of the resistor R6 are connected to a power supply of the whole sensor, and the second pin of the comparator U1, the other end of the resistor R5 and the other end of the capacitor C4 are grounded; the negative pole of diode D1 is connected with one end of resistance R7, the other end of resistance R7 is connected with one end of electric capacity C5 and MCU mainboard respectively, the other end ground connection of electric capacity C5.
Specifically, in the RS485 band isolation interface circuit:
the RS485 band isolation interface circuit comprises an RS485 transceiver U2 with isolation, a resistor R8, a resistor R9, a resistor R10, a capacitor C6 and a capacitor C7, wherein the model of the RS485 transceiver U2 is ADM2483;
the twelfth pin of the RS485 transceiver U2 is respectively connected with one end of a resistor R8, one end of a resistor R9 and a port A of an RS485 upper computer, the other end of the resistor R8 is connected to a power supply of the whole sensor, the thirteenth pin of the RS485 transceiver U2 is respectively connected with the other end of the resistor R9, one end of a resistor R10 and a port B of the RS485 upper computer, and the other end of the resistor R10 is grounded; the tenth pin, the eleventh pin and the fourteenth pin of the RS485 transceiver U2 are suspended; the eighth pin, the second pin, the ninth pin and the fifteenth pin of the RS485 transceiver U2 are grounded; the seventh pin, the sixth pin, the fifth pin, the fourth pin and the third pin of the RS485 transceiver U2 are respectively connected to ports corresponding to the MCU main board; the first pin and the sixteenth pin of the RS485 transceiver U2 are connected to a power supply of the sensor whole machine; one end of the capacitor C6 and one end of the capacitor C7 are connected to a power supply of the whole sensor, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
Specifically, the device also comprises a protection circuit, wherein two ends of the protection circuit are connected in parallel with a port A and a port B of the RS485 upper computer; can prevent lightning and static electricity, and has the function of protecting the whole RS485 passive wake-up device.
As shown in fig. 3 and fig. 4, the method for passively waking up RS485 with isolation with low power consumption according to the present invention needs to provide the above-mentioned passively waking up RS485 with isolation with low power consumption, and specifically includes the following steps:
the trigger instruction is isolated in the RS485 band isolated wake-up circuit through a capacitor C1 and a capacitor C2, is protected by a bidirectional TVS diode T1 (PESD 3V3L2 BT), is acquired by a resistor R1, a capacitor C3 and a resistor R2, is input into a comparator U1 (TS 881 ILT) through the resistor R2 to detect, is limited by the resistor R3, is divided by a resistor R4 and a resistor R5, is filtered by the resistor R6 and the capacitor C4, is output to a diode D1 from the output end of the comparator U1, is filtered by the diode D1, the resistor R7 and the capacitor C5, and is finally output to an MCU main board in a dormant state (the power consumption is about 10 uA);
and 4, the power supply of the whole sensor supplies power to the RS485 band isolation interface circuit, and the RS485 band isolation interface circuit starts to work, so that the sensor operates (the isolation interface circuit is an interface of the sensor), and data communication among the sensor, the RS485 upper computer and the MCU main board is realized through the RS485 band isolation interface circuit.
When the MCU main board, the sensor whole machine power supply and the RS485 band isolation interface circuit are not awakened, the MCU main board, the sensor whole machine power supply and the RS485 band isolation interface circuit are not started and are in a dormant standby state, the sensor controlled by the RS485 band isolation interface circuit is also in a closed state, and the power consumption of the whole machine is low; when the RS485 band isolation wake-up circuit transmits a trigger signal to the MCU main board, the MCU main board works to control the whole sensor power supply to start, power is supplied to the RS485 band isolation interface circuit, and the RS485 band isolation interface circuit is opened, so that the sensor operates; the purpose of the RS485 band isolation awakening circuit is to turn on the power supply of the RS485 band isolation interface circuit, and then realize the normal communication between the sensor, the RS485 upper computer and the MCU main board, wherein the RS485 band isolation interface circuit is a conduction channel.
Fig. 5 is a simulation diagram of the RS485 passive wake-up device, and the input waveform of the RS485 can be well restored by a series of processing, detection by a comparator, and the like, from the waveform simulated by Multisim. The waveform of fig. 5 is a waveform at an input frequency of 120KHz (i.e., an analog baud rate of 115200).
As shown in fig. 6a to 6c, in the waveforms actually measured, the trigger signals of the circuit device from 1200bps to 460800bps can be correctly and reliably transmitted through the test.
For the power consumption of the whole machine: (see tables 1 and 2)
Table 1: theoretical technical power consumption:
table 2: actual technical power consumption:
| input voltage (V) | Actual test current | Actual power consumption |
| 3.3 | 0.7uA | 2.31uW |
In summary, the invention has the following advantages:
1. the RS485 passive wake-up device has an isolation function;
2. the RS485 passive wake-up device can effectively reduce the overall power consumption of the RS485 isolated wake-up circuit;
3. the highest baud rate of the RS485 passive wake-up device can reach 460800bps.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a low-power consumption takes isolated RS485 passive awakening device, includes RS485 host computer, RS485 takes isolated awakening circuit, RS485 takes isolated interface circuit, MCU mainboard and sensor complete machine power, its characterized in that: the RS485 band isolation wake-up circuit comprises an isolation unit, a protection unit, a sampling unit, a detection unit and a filtering unit; the port A and the port B of the RS485 upper computer are respectively connected with two input ends of an isolation unit and two input ends of an RS485 band isolation interface circuit, the isolation unit is respectively connected with a protection unit and a sampling unit, the protection unit is further connected to the port A of the RS485 upper computer, the detection unit is respectively connected with the sampling unit, a filtering unit and a sensor whole machine power supply, the MCU main board is respectively connected with the filtering unit, the RS485 band isolation interface circuit and the sensor whole machine power supply, and the sensor whole machine power supply is further connected to the RS485 band isolation interface circuit.
2. The low power consumption, isolated RS485 passive wake up device of claim 1, wherein: the isolation unit comprises a capacitor C1 and a capacitor C2, the protection unit comprises a bidirectional TVS diode T1, the model of the bidirectional TVS diode T1 is PESD3V3L2BT, the sampling unit comprises a resistor R1, a capacitor C3 and a resistor R2, the detection unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C4 and a comparator U1, the model of the comparator U1 is TS881ILT, and the filtering unit comprises a diode D1, a resistor R7 and a capacitor C5;
one end of the capacitor C1 and one end of the capacitor C2 are correspondingly connected to a port A and a port B of the RS485 upper computer respectively, a first pin of the bidirectional TVS diode T1 is connected with the port A of the RS485 upper computer, the other end of the capacitor C1, one end of the resistor R1, one end of the capacitor C3 and one end of the resistor R2 respectively, a second pin of the bidirectional TVS diode T1 is suspended, and a third pin of the bidirectional TVS diode T1, the other end of the capacitor C2, the other end of the resistor R1 and the other end of the capacitor C3 are grounded; the third pin of the comparator U1 is respectively connected with the other end of the resistor R2 and one end of the resistor R3, the first pin of the comparator U1 is respectively connected with the other end of the resistor R3 and the anode of the diode D1, the fourth pin of the comparator U1 is respectively connected with one end of the resistor R4 and one end of the resistor R5, the fifth pin of the comparator U1 is respectively connected with one end of the resistor R6 and one end of the capacitor C4, the other end of the resistor R4 and the other end of the resistor R6 are connected to a power supply of the whole sensor, and the second pin of the comparator U1, the other end of the resistor R5 and the other end of the capacitor C4 are grounded; the negative pole of diode D1 is connected with one end of resistance R7, the other end of resistance R7 is connected with one end of electric capacity C5 and MCU mainboard respectively, the other end ground connection of electric capacity C5.
3. The low power consumption, isolated RS485 passive wake up device of claim 1, wherein: the RS485 band isolation interface circuit comprises an RS485 transceiver U2 with isolation, a resistor R8, a resistor R9, a resistor R10, a capacitor C6 and a capacitor C7, wherein the model of the RS485 transceiver U2 is ADM2483;
the twelfth pin of the RS485 transceiver U2 is respectively connected with one end of a resistor R8, one end of a resistor R9 and a port A of an RS485 upper computer, the other end of the resistor R8 is connected to a power supply of the whole sensor, the thirteenth pin of the RS485 transceiver U2 is respectively connected with the other end of the resistor R9, one end of a resistor R10 and a port B of the RS485 upper computer, and the other end of the resistor R10 is grounded; the tenth pin, the eleventh pin and the fourteenth pin of the RS485 transceiver U2 are suspended; the eighth pin, the second pin, the ninth pin and the fifteenth pin of the RS485 transceiver U2 are grounded; the seventh pin, the sixth pin, the fifth pin, the fourth pin and the third pin of the RS485 transceiver U2 are respectively connected to ports corresponding to the MCU main board; the first pin and the sixteenth pin of the RS485 transceiver U2 are connected to a power supply of the sensor whole machine; one end of the capacitor C6 and one end of the capacitor C7 are connected to a power supply of the whole sensor, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
4. The low power consumption, isolated RS485 passive wake up device of claim 1, wherein: the device also comprises a protection circuit, wherein two ends of the protection circuit are connected in parallel with a port A and a port B of the RS485 upper computer.
5. A low-power consumption RS485 passive wake-up method with isolation is characterized in that: the method needs to provide the low-power-consumption RS485 passive wake-up device with isolation according to claim 1, and specifically comprises the following steps:
step 1, the RS485 upper computer sends a trigger instruction to an RS485 band isolation and wake-up circuit; meanwhile, the RS485 upper computer also transmits a level signal to the RS485 band isolation interface circuit for the RS485 band isolation interface circuit to carry out data communication;
step 2, the triggering instruction is coupled and isolated in the RS485 band isolation and wake-up circuit through an isolation unit, the triggering instruction is protected by a protection unit, then is collected through a collection unit, is detected by a detection unit and is output to a filtering unit, and after being filtered by the filtering unit, the triggering instruction is finally output to an MCU main board in a dormant state;
step 3, identifying whether the triggering instruction meets the triggering condition through the MCU main board, if yes, controlling the power supply of the whole sensor to be turned on by the MCU main board, and entering step 4; if not, the power supply of the whole sensor is in a closed state;
and 4, the power supply of the whole sensor supplies power to the RS485 band isolation interface circuit, and the RS485 band isolation interface circuit starts to work, so that the sensor operates, and the sensor realizes data interaction with the MCU main board through the RS485 band isolation interface circuit.
6. The low power consumption RS485 passive wake-up method with isolation of claim 5, wherein: the step 2 specifically comprises the following steps:
the trigger instruction is isolated from the RS485 band isolation and wake-up circuit through a capacitor C1 and a capacitor C2, is protected by a bidirectional TVS diode T1, is input to a comparator U1 through a resistor R2 to detect after signals are acquired through a resistor R1, a capacitor C3 and a resistor R2, is limited by a resistor R3, is divided by a resistor R4 and a resistor R5, is filtered by a resistor R6 and a capacitor C4, is output to a diode D1 from the output end of the comparator U1, is filtered by a diode D1, a resistor R7 and a capacitor C5, and is finally output to an MCU motherboard in a dormant 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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107918331A CN107918331A (en) | 2018-04-17 |
| CN107918331B true CN107918331B (en) | 2023-04-25 |
Family
ID=61894401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711434703.5A Active CN107918331B (en) | 2017-12-26 | 2017-12-26 | Low-power-consumption RS485 passive awakening device and method with isolation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107918331B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450480B (en) * | 2018-12-14 | 2024-01-23 | 广东电网有限责任公司 | RS-485 communication circuit and power supply system |
| CN110336456B (en) * | 2019-07-16 | 2021-02-19 | 赵红雁 | Awakening drive circuit of low-voltage power supply of electric automobile |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997011428A1 (en) * | 1995-09-19 | 1997-03-27 | Microchip Technology Incorporated | Microcontroller wake-up function having digitally programmable threshold |
| US5974552A (en) * | 1995-12-29 | 1999-10-26 | Samsung Electronics Co., Ltd. | Method and apparatus for executing a scheduled operation after wake up from power off state |
| EP1617180A1 (en) * | 2004-07-12 | 2006-01-18 | Feig Electronic GmbH | Position sensor and method to determine the position of a rotating shaft |
| CN2854903Y (en) * | 2004-10-29 | 2007-01-03 | 深圳市杰麟控制系统有限公司 | Remote control terminal with fault wake-up circuit |
| CN202889340U (en) * | 2012-09-17 | 2013-04-17 | 上海桑锐电子科技有限公司 | Low-power short-distance wireless data transmission module |
| CN205540038U (en) * | 2016-02-01 | 2016-08-31 | 哈尔滨威帝电子股份有限公司 | General type automobile body control module based on CAN bus |
| CN106713097A (en) * | 2017-02-08 | 2017-05-24 | 广州致远电子股份有限公司 | CAN transmitting-receiving module |
| WO2017165906A1 (en) * | 2016-03-29 | 2017-10-05 | Xped Holdings Pty Ltd | Method and apparatus for a network and device discovery |
-
2017
- 2017-12-26 CN CN201711434703.5A patent/CN107918331B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997011428A1 (en) * | 1995-09-19 | 1997-03-27 | Microchip Technology Incorporated | Microcontroller wake-up function having digitally programmable threshold |
| US5974552A (en) * | 1995-12-29 | 1999-10-26 | Samsung Electronics Co., Ltd. | Method and apparatus for executing a scheduled operation after wake up from power off state |
| EP1617180A1 (en) * | 2004-07-12 | 2006-01-18 | Feig Electronic GmbH | Position sensor and method to determine the position of a rotating shaft |
| CN2854903Y (en) * | 2004-10-29 | 2007-01-03 | 深圳市杰麟控制系统有限公司 | Remote control terminal with fault wake-up circuit |
| CN202889340U (en) * | 2012-09-17 | 2013-04-17 | 上海桑锐电子科技有限公司 | Low-power short-distance wireless data transmission module |
| CN205540038U (en) * | 2016-02-01 | 2016-08-31 | 哈尔滨威帝电子股份有限公司 | General type automobile body control module based on CAN bus |
| WO2017165906A1 (en) * | 2016-03-29 | 2017-10-05 | Xped Holdings Pty Ltd | Method and apparatus for a network and device discovery |
| CN106713097A (en) * | 2017-02-08 | 2017-05-24 | 广州致远电子股份有限公司 | CAN transmitting-receiving module |
Non-Patent Citations (2)
| Title |
|---|
| 李林琛 等.基于JN5148的煤矿物联网络系统设计方案.《煤炭技术》.2012,第第31卷卷(第第12期期),第271-173页. * |
| 谭震宇. AMI系统下基于嵌入式Linux的专变采集终端设计.《中国优秀硕士学位论文全文数据库》.2012,(第第12期期),第C042-174页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107918331A (en) | 2018-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103729995A (en) | Wireless remote-transmission meter reading device with ultralow-power-consumption awakening function and awakening method thereof | |
| CN202758378U (en) | Active RFID electronic label | |
| CN104200612B (en) | In a kind of car, baby detects alarm device | |
| CN206358095U (en) | A kind of Low-power-consumptiodormancy dormancy circuit of new-energy automobile electronics VCU modules | |
| CN202758480U (en) | Power-saving remote control | |
| CN105225316A (en) | A kind of dormancy of electron key low-power consumption power supply plan and awakening method | |
| CN106427835A (en) | Low-power-consumption dormancy circuit of new energy automobile electronic VCU module | |
| CN107918331B (en) | Low-power-consumption RS485 passive awakening device and method with isolation | |
| CN103472377A (en) | Partial discharging point locating device for GIS type test based on vibration detection | |
| CN103822667A (en) | Temperature-humidity acquisition system based on Bluetooth technology | |
| CN103313365B (en) | Long-distance Control metering system | |
| CN202372938U (en) | Telequipment | |
| CN205583839U (en) | Computer integrated protection measurement and control device of transformer substation | |
| CN208924233U (en) | A kind of super low-power consumption bluetooth-serial ports transparent transmission conversion module | |
| CN203870786U (en) | Wireless remote meter reading equipment with ultra-low-power wakeup function | |
| CN205596357U (en) | Open -air detection device of low -power consumption | |
| CN203069733U (en) | A vibration-detection-based partial discharging point positioning device used for GIS tests | |
| CN104554086A (en) | Vehicle tracking device capable of accumulating working hours of construction machinery | |
| CN208421596U (en) | A kind of low-power consumption sound collection equipment automatically waken up with suspend mode | |
| CN207799396U (en) | A kind of passive Rousers of RS485 of low-power consumption band isolation | |
| CN205450962U (en) | Energy -conserving computery | |
| CN204087427U (en) | Baby's detection alarm device in a kind of car | |
| CN203732930U (en) | An energy source data acquisition terminal with two RS485 interfaces | |
| CN112467863A (en) | Dual-power switching communication device and method for glucometer | |
| CN202798060U (en) | Cell energy saving device and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |