CN202677608U

CN202677608U - M-BUS collector

Info

Publication number: CN202677608U
Application number: CN 201220385479
Authority: CN
Inventors: 李举成; 肖盛旺; 马圣; 燕姣
Original assignee: Hunan Weiming Energy Technology Co Ltd
Current assignee: Hunan Weiming Energy Technology Co Ltd
Priority date: 2012-08-06
Filing date: 2012-08-06
Publication date: 2013-01-16
Anticipated expiration: 2022-08-06

Abstract

The utility model discloses an M-BUS collector which comprises a microcontroller, an M-BUS communication unit, an M-BUS protection unit and an M-BUS power supply unit. The M-BUS protection unit comprises a short circuit detection unit, a short circuit protection unit and a bus dual control unit; the microcontroller grasps the control right of M-BUS through the bus dual control unit; the short circuit detection unit detects fault signals of short circuit or overload of an M-BUS circuit and sends the fault signals to the short circuit detection unit; the short circuit detection unit intercepts the control right of M-BUS through the bus dual control unit, so as to realize bus closing; and when M-BUS short circuit or overload abnormal faults are removed, the microcontroller grasps the control right of M-BUS again. The M-BUS collector can guarantee the normal operation of a collection system and a communication module, thereby greatly improving the safety performances of a collector and meters.

Description

The M-BUS collector

Technical field

The utility model relates to a kind of data acquisition unit, particularly a kind of M-BUS collector with defencive function.

Background technology

Along with the demand of domestic energy control ability promotes, energy-conservation communicate by letter with the M-BUS of convenient construction and the low voltage electric power carrier communication technology in the widespread use of means of non-electric energy sources metering field, in water, gas, heat, ammeter, brought convenience to huge numbers of families.Used M-BUS collector comprises the relevant control unit such as microcontroller, power supply unit, storage unit, M-BUS communication unit, M-BUS power supply unit in the market.Microcontroller is controlled M-BUS, and M-BUS sends data to microcontroller.But owing to have now the self diagnosis of collector, protective capability poor; under the networking model of complexity; when overload or short circuit occur in the descending table meter of certain collector bus or certain; might directly destroy the collector module; in case generation Similar Problems; the technical support personnel can't investigate to go wrong within the shortest time and come from a little, and has caused the paralysis of whole acquisition system.The existence of these problems has seriously influenced the convenience that the domestic energy system brings to the resident in implementation process.

The utility model content

The purpose of this utility model provides a kind of M-BUS collector of guaranteeing the safety of collector in the system and table meter.

This M-BUS collector that the utility model provides; comprise microcontroller; the M-BUS communication unit; the M-BUS power supply unit; it is characterized in that; between M-BUS power supply unit and M-BUS communication unit, be connected a M-BUS protected location; described M-BUS protected location is by the short-circuit detecting unit; short-circuit protection unit and bus dual control unit processed forms; connect a bus dual control unit processed on the M-BUS bus circuit; grasped the control of M-BUS under the normal operating conditions by bus dual control unit processed by microcontroller; short circuit or the overload fault signal of short-circuit detecting unit inspection M-BUS bus circuit; and fault-signal is sent to the short-circuit protection unit; the short-circuit protection unit is by bus dual control unit intercepting processed M-BUS control; realize bus-off; when M-BUS short circuit or overload after abnormal failure is excluded, microcontroller is grasped the control of M-BUS again by bus dual control unit processed.

The utlity model has perfect fault detect and defencive function, descending M-BUS bus interface circuit adopts dual control strategy processed.Circuit arranges holding circuit priority and is higher than microcontroller, and under normal circumstances, microcontroller is grasped the control of bus, sends instruction control bus state by MCU; When detecting the fault such as short circuit, holding circuit is in time sent signal, the bus short circuit of announcement or overload messages, and intercepting M-BUS bus control right, and the consumer such as protection collector and descending table meter and interlock circuit are not damaged; When short circuit on the bus or the overload unusually be excluded after, microcontroller can be grasped the control of bus again, system reenters normal operating conditions.This process realizes fully automatically, need not anyly manually to set up into.Like this, be short-circuited or during overload situations, can automatically shut down the M-BUS bus power source at M-BUS, guarantee the normal operation of acquisition system and communication module, thereby just significantly improved the security performance of collector and table meter in the system.

Description of drawings

Fig. 1 is the composition frame chart of M-BUS collector of the present utility model.

Fig. 2 is the structured flowchart of M-BUS protected location of the present utility model.

Fig. 3 is short-circuit detecting of the present utility model unit physical circuit figure.

Fig. 4 is short-circuit protection of the present utility model unit physical circuit figure.

Fig. 5 is the physical circuit figure of bus dual control of the present utility model unit processed.

Embodiment

As shown in Figure 1, this M-BUS collector that the utility model provides comprises microcontroller, M-BUS bus unit, storage unit, communication unit; Between M-BUS power supply unit and M-BUS communication unit, be connected a M-BUS protected location.Described storage unit comprises that communication unit is supported up PLC and radio communication be used to storing the important informations such as descending table meter archives, data and clock, and descending be furnished with two-way M-BUS output port, and support local serial ports or infrared maintenance function.Power supply unit provides reliable and stable power supply for collector; The plc communication unit is collector uplink communication unit; The M-BUS power supply unit provides power supply for descending M-BUS bus; The M-BUS protected location provides M-BUS to improve fault detect and defencive function; The M-BUS communication unit provides the descending M-BUS bus interface of powerful load capacity; The local maintenance unit provides collector local maintenance function; The infrared communication unit provides remote infrared communication interface; Storage unit provides large capacity storage space, can preserve 200 perfect table meter archives, and power failure data can be preserved 10 years; Clock unit provides the collector correct time.

As shown in Figure 2; described M-BUS protected location is by the short-circuit detecting unit; short-circuit protection unit and bus dual control unit processed forms; connect a bus dual control unit processed on the M-BUS bus circuit; grasped the control of M-BUS by bus dual control unit processed by microcontroller; the short circuit of short-circuit detecting unit inspection M-BUS bus circuit or the fault-signal of overload; and fault-signal is sent to the short-circuit protection unit; the short-circuit protection unit is by bus dual control unit intercepting processed M-BUS control; realize bus-off; when M-BUS short circuit or overload after abnormal failure is excluded, microcontroller is grasped the control of M-BUS again.

As shown in Figure 3; described short-circuit detecting unit comprises a comparer; its in-phase input end is connected with M-BUS power supply 3 by resistance 8; its inverting input is connected with M-BUS power supply 2 by resistance 6 rear resistance in seriess 9; ground connection after resistance 6 other ends are connected with resistance 7; be connected between the inverting input and ground of comparer 1 after electric capacity 10 and resistance 11 are in parallel; its power supply termination power 4; its earth terminal ground connection; its output terminal is connected with M-BUS power supply 3 by resistance 12; simultaneously, diode of its output terminal series connection 13 is rear delivers to the short-circuit protection unit to detection signal by output terminal 5.

As shown in Figure 4, described short-circuit protection unit comprises an optocoupler 14, an enhancement mode P channel MOS field effect transistor 15, a positive-negative-positive triode 16 and a NPN type triode 17.

Access an anode tap of common-cathode dual-diodes 21 via terminal 19 from the M-BUS control signal of microcontroller, another anode tap of these duodiodes 21 is accessed on another road via terminal 20 from the M-BUS control signal of microcontroller, the anode of these duodiode 21 output terminal resistance in seriess 22 rear access optocouplers 14, its negative electrode connects simulation ground, its emitter grounding;

The drain electrode of metal-oxide-semiconductor field effect transistor 15 connects M-BUS power supply 18, the collector of its gate series resistance 23 access optocouplers 14, and resistance 24 is connected between its grid and the power supply 18;

The emitter of triode 16 connects the source electrode of metal-oxide-semiconductor field effect transistor 15, and its base stage is passed through to link to each other with the collector of triode 17 behind the resistance 28, and its collector links to each other with terminal 30;

Access the base stage of triodes 17 via terminal 5 resistance in seriess 25 from the signal of short-circuit detecting unit, be connected between its base stage and the emitter after electric capacity 26 and resistance 27 are in parallel, its grounded emitter, its base stage links to each other with terminal 30 by resistance 29, and control signal is reached microcontroller.

As shown in Figure 5, described bus dual control unit processed comprises an optocoupler 31 and an enhancement mode P channel MOS field effect transistor 32.

Access the anode of optocouplers 31 through resistance 37 via terminal 34 from the signal of microcontroller, another control signal connects its negative electrode via terminal 35, resistance 36 is connected between terminal 34 and the terminal 35, and its collector is connected its emitter grounding by resistance 39 resistance in seriess 38 with M-BUS power supply 18;

The drain electrode of metal-oxide-semiconductor field effect transistor 32 links to each other with M-BUS power supply 18; M-BUS power supply 18 is by an anode tap of resistance 39 access common-cathode dual-diodes 33; access another anode tap of these duodiodes 33 via terminal 30 from the control signal of short-circuit protection unit; the output terminal of this duodiode 33 is connected with the grid of metal-oxide-semiconductor field effect transistor 32; its source electrode is by resistance 40 ground connection; simultaneously, its source electrode is sent to the M-BUS bus circuit with control signal via terminal 41.

During use, circuit arranges short-circuit protection unit priority and is higher than microcontroller, and descending M-BUS bus interface adopts dual control strategy processed.The monitoring bus communications status is responsible in the short-circuit detecting unit, when the abnormal conditions such as bus transmission short circuit or overload, in time sends signal, short-circuit protection unit bus short circuit or the overload messages of announcement.The short-circuit protection unit is by bus dual control unit intercepting processed M-BUS control.Bus dual control unit processed can by microcontroller and short-circuit protection unit the two respectively and the different period M-BUS is controlled.Under normal circumstances, microcontroller is grasped the control of bus, has microcontroller to send instruction control bus duty.When being short-circuited or transship, the short-circuit detecting unit provides instruction, grasps bus control right by the short-circuit protection unit, realizes bus-off, thereby holding circuit is not damaged because of short circuit or overload.When short circuit on the bus or overload after abnormal failure is excluded, microcontroller can be grasped the control of bus again by bus dual control unit processed, and system reenters normal operating conditions, and this process need not any artificial setting, and realization is finished fully automatically.

Claims

1. M-BUS collector; comprise microcontroller; the M-BUS communication unit; the M-BUS power supply unit; it is characterized in that; between M-BUS power supply unit and M-BUS communication unit, be connected a M-BUS protected location; described M-BUS protected location is by the short-circuit detecting unit; short-circuit protection unit and bus dual control unit processed forms; connect a bus dual control unit processed on the M-BUS bus circuit; grasped the control of M-BUS under the normal operating conditions by bus dual control unit processed by microcontroller; short circuit or the overload fault signal of short-circuit detecting unit inspection M-BUS bus circuit; and fault-signal is sent to the short-circuit protection unit; the short-circuit protection unit is by bus dual control unit intercepting processed M-BUS control; realize bus-off; when M-BUS short circuit or overload after abnormal failure is excluded, microcontroller is grasped the control of M-BUS again by bus dual control unit processed.

2. M-BUS collector according to claim 1; it is characterized in that; described short-circuit detecting unit comprises a comparer (1); its in-phase input end is connected with power supply (3) by resistance (8); its inverting input is connected with power supply (2) by resistance in series (9) behind the resistance (6); ground connection after power supply (3) is connected with resistance (7) by resistance (6); electric capacity (10) be connected between the inverting input and ground of comparer (1) after resistance (11) is in parallel; its power supply termination power (4); its earth terminal ground connection; its output terminal is connected with power supply (3) by resistance (12); simultaneously, behind its output terminal diode of series connection (13) detection signal is delivered to the short-circuit protection unit by output terminal (5).

3. M-BUS collector according to claim 1, it is characterized in that described short-circuit protection unit comprises an optocoupler (14), an enhancement mode P channel MOS field effect transistor (15), a positive-negative-positive triode (16) and a NPN type triode (17); Access an anode tap of common-cathode dual-diode (21) via terminal (19) from the M-BUS control signal of microcontroller, another anode tap of this duodiode (21) is accessed on another road via terminal (20) from the M-BUS control signal of microcontroller, the anode of access optocoupler (14) after this duodiode (21) output terminal resistance in series (22), its negative electrode connects simulation ground, its emitter grounding; The drain electrode of metal-oxide-semiconductor field effect transistor (15) connects M-BUS power supply (18), the collector of its gate series resistance (23) access optocoupler (14), and resistance (24) is connected between its grid and the power supply (18); The emitter of triode (16) connects the source electrode of metal-oxide-semiconductor field effect transistor (15), and its base stage links to each other with the collector of triode (17) by behind the resistance (28), and its collector links to each other with terminal (30); Access the base stage of triode (17) via terminal (5) resistance in series (25) from the signal of short-circuit detecting unit, electric capacity (26) be connected between its base stage and the emitter after resistance (27) is in parallel, its grounded emitter, its base stage links to each other with terminal (30) by resistance (29), and control signal is reached microcontroller.

4. M-BUS collector according to claim 1 is characterized in that, described bus dual control unit processed comprises an optocoupler (31) and an enhancement mode P channel MOS field effect transistor (32); Power supply signal is via the anode of terminal (34) through resistance (37) access optocoupler (31), another control signal connects its negative electrode via terminal (35), resistance (36) is connected between terminal (34) and the terminal (35), its collector is connected its emitter grounding by resistance (39) resistance in series (38) with M-BUS power supply (18); The drain electrode of metal-oxide-semiconductor field effect transistor (32) links to each other with M-BUS power supply (18); M-BUS power supply (18) is by an anode tap of resistance (39) access common-cathode dual-diode (33); access another anode tap of this duodiode (33) via terminal (30) from the control signal of short-circuit protection unit; the output terminal of this duodiode (33) is connected with the grid of metal-oxide-semiconductor field effect transistor (32); its source electrode is by resistance (40) ground connection; simultaneously, its source electrode is sent to the M-BUS bus circuit with control signal via terminal (41).