CN203720576U - Circuit for reducing the power consumption of RS485 communication or RS232 communication - Google Patents
Circuit for reducing the power consumption of RS485 communication or RS232 communication Download PDFInfo
- Publication number
- CN203720576U CN203720576U CN201320679838.9U CN201320679838U CN203720576U CN 203720576 U CN203720576 U CN 203720576U CN 201320679838 U CN201320679838 U CN 201320679838U CN 203720576 U CN203720576 U CN 203720576U
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- communication
- circuit
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- power consumption
- electric capacity
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- Y02P80/114—
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- Small-Scale Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Dc Digital Transmission (AREA)
Abstract
The utility model discloses a circuit for reducing the power consumption of RS485 communication or RS232 communication, and especially, the power consumption of a communication circuit is reduced to zero when a communication bus has no signal. A signal detecting circuit is composed of a NPN triode, two capacitors and two resistors. A power supply control circuit is composed of a PNP triode, two capacitors and two resistors. Signals from the bus are detected by the signal detecting circuit, then the power control circuit controls the on-off of a power supply, and the aim of reducing the power consumption is attained by closing the power supply when the communication bus has no signal. The circuit is low in cost and simple in structure, and is stable and reliable, and greatly reduces the power consumption of RS485 communication or RS232 communication when the bus has no signal. The circuit has the remarkable effects of low cost, simple structure, stabilization and reliability, and greatly reduces the power consumption of RS485 communication or RS232 communication circuit applied in the industrial communication.
Description
Technical field
The utility model has related to the circuit of a kind of RS485 of reduction or RS232 communication power consumption, and while especially there is no communication signal in bus, communicating circuit power-dissipation-reduced is not zero.
Background technology
RS485 and RS232 communicating circuit are widely used in various Industry Control, and current used communicating circuit is the not consideration to power consumption substantially, for a long time in power consumption state.And along with client requires to improve constantly to product power consumption, the design of circuit is also had higher requirement.
Industry spot is not many times constantly in communication state, reduces the power consumption particular importance that just seems while how there is no signal on communication bus.The utility model provides a kind of circuit, can detect on communication bus whether have signal, cuts off the power supply of communicating circuit while there is no signal in bus, and power consumption is zero; When bus has signal, opening power, makes communicating circuit in normal operating conditions.
Summary of the invention
The utility model provides the circuit of a kind of RS485 of reduction or RS232 communicating circuit power consumption, and this circuit is controlled simple, and cost is low, and peripheral components is few, reliable and stable.
The utility model comprises input part and two parts of power control part, it is characterized in that: the triode (Q1) that comprises 1 NPN, the triode of 1 PNP (Q2), 4 resistance, are respectively resistance 1(R1), resistance 2(R2), resistance 3(R3) and, resistance 4(R4), 4 ceramic condensers, be respectively electric capacity 1(C1), electric capacity 2(C2), electric capacity 3(C3), electric capacity 4(C4), wherein: described electric capacity 1(C1) be connected with communication bus, the other end and resistance 3(R3) be connected, resistance 3(R3) the other end is connected to the base stage of NPN triode (Q1), the direct ground connection of emitter, collector is by resistance 1(R1) be connected with power supply, a pin of collector and MCU is connected simultaneously, PNP triode (Q2) emitter is directly connected with power supply, collector and electric capacity 3(C3), electric capacity 4(C4), the energization pins of RS485 or RS232 communicating circuit is connected, base stage and resistance 2(R2) with resistance 4(R4) be connected, resistance 4(R4) another pin of the other end and MCU is connected.
The utility model in RS485 application circuit, electric capacity 1(C1) be connected with positive pole (+) signal wire in RS485 communication, for detection of whether there being signal in RS485 bus.
The utility model in RS232 application circuit, electric capacity 1(C1) be connected with the RX signal wire in RS232 communication, for detection of whether there being signal in RS232 bus.
The collector of the triode of the NPN that the testing circuit in the utility model partly comprises (Q1) is to be connected with the interrupt pin of MCU, by this pin, the signal detecting can be passed to MCU.
While having signal in testbus, by power control part, provide power supply to RS485 or RS232 communicating circuit; If the signal not having is cut off the electricity supply, so just realize while there is no communication in bus, RS485 or RS232 communicating circuit power consumption are zero, reach the object of saving power consumption.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit structure diagram of a kind of RS485 of reduction or RS232 communication power consumption.
Embodiment
The utility model is by testbus state, and while having signal on communication bus, powered-down reaches the object that reduces power consumption.Electric capacity 1(C1 in accompanying drawing 1) be connected with communication bus, the other end is connected with resistance 3 (R3), the other end of resistance 3 (R30) is connected to the base stage of NPN triode (Q1), the direct ground connection of emitter, collector is by resistance 1(R1) be connected with power supply, a pin of collector and MCU is connected to form signal deteching circuit, the state of testbus simultaneously; PNP triode (Q2) emitter is directly connected with power supply, collector and electric capacity 3(C3), electric capacity 4(C4), the energization pins of RS485 or RS232 communicating circuit is connected, base stage is connected with resistance 2 (R2), resistance 4 (R4), resistance 4(R4) another pin of the other end and MCU is connected, and forms power control circuit.When communication interface does not have signal to transmit, signal deteching circuit detects does not have signal in bus, so power control circuit will powered-down, reaches the object of saving power consumption.
Claims (1)
1. reduce a circuit for RS485 or RS232 communication power consumption, comprise input part and two parts of power control part, it is characterized in that: the triode (Q1) that comprises 1 NPN, the triode of 1 PNP (Q2), 4 resistance, are respectively resistance 1(R1), resistance 2(R2), resistance 3(R3) and, resistance 4(R4), 4 ceramic condensers, be respectively electric capacity 1(C1), electric capacity 2(C2), electric capacity 3(C3), electric capacity 4(C4), wherein: described electric capacity 1(C1) be connected with communication bus, the other end and resistance 3(R3) be connected, resistance 3(R3) the other end is connected to the base stage of NPN triode (Q1), the direct ground connection of emitter, collector is by resistance 1(R1) be connected with power supply, a pin of collector and MCU is connected simultaneously, PNP triode (Q2) emitter is directly connected with power supply, collector and electric capacity 3(C3), electric capacity 4(C4), the energization pins of RS485 or RS232 communicating circuit is connected, base stage and resistance 2(R2) with resistance 4(R4) be connected, resistance 4(R4) another pin of the other end and MCU is connected.
2. a kind of circuit that reduces RS485 or RS232 communication power consumption according to claim 1, is characterized in that the electric capacity 1(C1 in described testing circuit) be connected with positive pole (+) signal wire in RS485 communication.
3. a kind of circuit that reduces RS485 or RS232 communication power consumption according to claim 1, is characterized in that the electric capacity 1(C1 in described testing circuit) be connected with the RX signal wire in RS232 communication.
4. a kind of circuit that reduces RS485 or RS232 communication power consumption according to claim 1, is characterized in that, the collector of the triode of the NPN in described testing circuit (Q1) is to be connected with the interrupt pin of MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320679838.9U CN203720576U (en) | 2013-10-31 | 2013-10-31 | Circuit for reducing the power consumption of RS485 communication or RS232 communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320679838.9U CN203720576U (en) | 2013-10-31 | 2013-10-31 | Circuit for reducing the power consumption of RS485 communication or RS232 communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203720576U true CN203720576U (en) | 2014-07-16 |
Family
ID=51159716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320679838.9U Expired - Fee Related CN203720576U (en) | 2013-10-31 | 2013-10-31 | Circuit for reducing the power consumption of RS485 communication or RS232 communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203720576U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028508A (en) * | 2018-06-01 | 2018-12-18 | 青岛海尔空调电子有限公司 | Air-conditioning line control machine power supply communication circuit |
-
2013
- 2013-10-31 CN CN201320679838.9U patent/CN203720576U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028508A (en) * | 2018-06-01 | 2018-12-18 | 青岛海尔空调电子有限公司 | Air-conditioning line control machine power supply communication circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Circuit for reducing the power consumption of RS485 communication or RS232 communication Effective date of registration: 20150605 Granted publication date: 20140716 Pledgee: Wuhan rural commercial bank Limited by Share Ltd Optics Valley branch Pledgor: Wuhan Maiwe Optoelectronics Technology Co., Ltd. Registration number: 2015990000446 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20170607 Granted publication date: 20140716 Pledgee: Wuhan rural commercial bank Limited by Share Ltd Optics Valley branch Pledgor: Wuhan Maiwe Optoelectronics Technology Co., Ltd. Registration number: 2015990000446 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20161031 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |