CN202615602U - M-BUS slave-station power supply circuit - Google Patents
M-BUS slave-station power supply circuit Download PDFInfo
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- CN202615602U CN202615602U CN 201220153260 CN201220153260U CN202615602U CN 202615602 U CN202615602 U CN 202615602U CN 201220153260 CN201220153260 CN 201220153260 CN 201220153260 U CN201220153260 U CN 201220153260U CN 202615602 U CN202615602 U CN 202615602U
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Abstract
The utility model discloses an M-BUS slave-station power supply circuit, and aims to provide an M-BUS slave-station power supply circuit by which a slave station consumes less current of a bus. The power supply circuit comprises an input circuit, a controllable current source, a diode D2 and a battery, wherein the input and of the controllable current source is connected with the positive output end of the input circuit, the output end of the controllable current source is connected with the positive pole of the diode, the negative pole of the diode is connected with the positive pole of the battery, the negative pole of the battery is connected with the negative output end of the input circuit, the control end of the controllable current source is a data input end, the output end of the controllable current source is a second voltage end, and the positive pole of the battery is a first voltage end. A CPU (central processing unit) of a slave station controls the output current of the controllable current source through a data input end, the first voltage end supplies power for the CPU, and the second voltage end supplies power for a receiving circuit of the slave station. The power supply circuit disclosed by the utility model is subjected to battery clamping and voltage stabilization and a voltage stabilizing circuit is omitted, therefore, the required current is far small. The power supply circuit disclosed by the utility model is applicable to all M-BUS buses.
Description
Technical field
The utility model relates to a kind of feed circuit, especially relates to a kind of improvement to M-BUS bus slave station power supply circuit construction.
Background technology
The M-Bus bus is the free two-wire system bus of the current international practice,, adopt one main one from or one main many from, semiduplex communication modes; Can adopt general twisted-pair power cable to press randomly topologically structured cable wiring manufacture, need not distinguish polarity during connection, have the advantages that wiring is simple, cost is low.Be mainly used in remote collection field like water meter, calorimeter, gas meter, flow meter equal energy source consumption data.
Fig. 1 is the transmission principle figure of M-bus bus.
The information of main website to slave station transmits through the mode of " main website changes bus voltage, slave station detects this variation ".
The information of slave station to main website transmits through the mode of " electric current, main website that slave station changes drain bus detect this variation ".
When bus is idle, master and slave station maintenance mark condition (bus is a high level, the slave station electric current 2mA).
The appendix B of the city-building industry standard of China " CJ/T 188-2004 user measuring instrument data transmission technology condition " has made specified in more detail to the M-Bus electric interfaces.Clause regulation B.1.2 wherein " each slave station drain bus electric current should be not less than 64 slave stations less than the driving force of 2mA, main website ".
The driving force of main website and slave station drain bus size of current are closely related, and the little then main website of slave station drain bus electric current can drive more slave station.In typical M-bus slave station circuit as shown in Figure 2; Slave station drain bus size of current is limited by the minimum steady current of voltage stabilizing diode and can't further reduces, and limited the further reduction of slave station drain bus electric current, also limited the increase that main website drives slave station quantity.
The 4.1.3 clause of " CJ/T 188-2004 user measuring instrument data transmission technology condition " is also stipulated: " instrument that constitutes the centralized meter-reading system slave station should adopt internal battery; battery normal service time, and calorimeter should be not less than 5 years, water meter and gas meter, flow meter should be not less than 6 years ".Based on the regulation of this clause, the slave station instrument generally adopts high capacity primary property battery, and arrival must be changed after tenure of use, and the later maintenance expense is higher.
Summary of the invention
The utility model mainly is to solve existing in prior technology slave station current sinking to be limited by the minimum steady current of voltage stabilizing diode and can't further to reduce; Thereby the restriction main website drives the technical matters of slave station quantity; Provide a kind of and do not use mu balanced circuit of the prior art to make the slave station consumed current not limited by the minimum steady current of voltage stabilizing diode, can make main website drive the M-BUS bus slave station feed circuit of a greater number slave station.
The utility model mainly is able to solve through following technical proposals to above-mentioned technical matters: a kind of M-BUS bus slave station feed circuit; Comprise input circuit, controllable current source, diode D2 and battery; The input end of said controllable current source is connected with the positive output end of said input circuit; The output terminal of said controllable current source connects the positive pole of diode, and the negative pole of said diode connects the positive pole of battery, and the negative pole of said battery connects the negative output terminal of input circuit; The control end of said controllable current source is a data input pin; The negative output terminal of said input circuit is a common port, and the output terminal of said controllable current source is second voltage end, just very first voltage end of said battery.The CPU of slave station controls the output current of controllable current source through data input pin, and first voltage end is the CPU power supply, and second voltage end is the receiving circuit power supply of slave station.Compare the typical slave station feed circuit of prior art, the utility model has saved mu balanced circuit but by the voltage stabilizing of battery clamper, the required electric current of battery clamper is generally 0.5uA, much smaller than the steady current (being generally 0.5mA) of voltage stabilizing diode.
As preferably; Said controllable current source comprises resistance R 1, resistance R 2, resistance R 3, diode D3, diode D4, triode Q1 and triode Q2; Said resistance R 1 is connected between the collector and base stage of triode Q1, and the negative pole of said diode D3 connects the base stage of triode Q1; One end of said resistance R 2 connects the emitter of triode Q1, and the other end connects the positive pole of diode D3; Said resistance R 3 one ends connect the emitter of triode Q1, and the other end connects the emitter of triode Q2; The collector of said triode Q2 connects the positive pole of diode D3; The base stage of said triode Q2 connects the negative pole of diode D4; Just very second voltage end of said diode D3; The just very data input pin of said diode D4, the current collection of said triode Q1 is the input end of controllable current source very.Can control the output current size of controllable current source through data input pin, thereby information is issued main website.
As preferably, said battery is a rechargeable battery.Use rechargeable battery to replace high capacity cell, can reduce cost, increase the service life.
As preferably, M-BUS bus slave station feed circuit also comprise battery protecting circuit, and said battery protecting circuit is parallelly connected with battery.When charging voltage surpassed the safe charging voltage of battery, holding circuit conducting discharge guaranteed that rechargeable battery is not damaged.
As preferably, said battery protecting circuit is diode D5, and the positive pole of said diode D5 connects the negative pole of battery, and the negative pole of said diode D5 connects the positive pole of battery.Zener diode can be used as the protection device.
The beneficial effect that the utility model brings is; Utilize battery clamper, bus to provide the mode of electric current stabilized voltage supply to be provided, reduce the bus current that slave station consumes, make identical main website can articulate more slave station for receiving circuit; Reduced system cost; Replace disposable high capacity cell with rechargeable battery, the requirement that has reduced battery capacity has also reduced later maintenance expense, more energy-conservation and environmental protection simultaneously.
Description of drawings
Fig. 1 is the transmission principle figure of M-BUS;
Fig. 2 is the M-BUS slave station power supply circuit of prior art;
Fig. 3 is a kind of M-BUS slave station power supply circuit of the utility model;
Fig. 4 is the circuit diagram of a kind of practical application of the utility model.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of the utility model.
Embodiment: a kind of M-BUS bus slave station feed circuit of present embodiment; As shown in Figure 3; Comprise input circuit, controllable current source E1, diode D2, battery B1 and battery protecting circuit B2, the input end of controllable current source E1 is connected with the positive output end of input circuit, and the output terminal of controllable current source E1 connects the positive pole of diode D2; The negative pole of diode D2 connects the positive pole of battery B1; The negative pole of battery B1 connects the negative output terminal of input circuit, and the control end of controllable current source E1 is a data input Tx_IN end, and the negative output terminal of input circuit is common port COM; The output terminal of said controllable current source is the second voltage end V2, the just very first voltage end V1 of said battery.Battery protecting circuit B2 is parallelly connected with battery B1
As shown in Figure 3; Controllable current source E1 comprises resistance R 1, resistance R 2, resistance R 3, diode D3, diode D4, triode Q1 and triode Q2; Resistance R 1 is connected between the collector and base stage of triode Q1, and the negative pole of diode D3 connects the base stage of triode Q1; One end of resistance R 2 connects the emitter of triode Q1, and the other end connects the positive pole of diode D3; Resistance R 3 one ends connect the emitter of triode Q1, and the other end connects the emitter of triode Q2; The collector of triode Q2 connects the positive pole of diode D3; The base stage of triode Q2 connects the negative pole of diode D4; Just very second voltage end of diode D3, the just very data input pin of diode D4, the current collection of said triode Q1 is the input end of controllable current source very.Triode Q1 is the NPN pipe, and triode Q2 is the PNP pipe, and diode D3 is the LM385 of 2.5V.
Battery B1 is a rechargeable battery.Battery protecting circuit B2 is diode D5.The positive pole of diode D5 connects the negative pole of battery B1, and the negative pole of diode D5 connects the positive pole of battery B1.
The output of controllable current source E1 meets anode and the holding circuit B2 of battery B1 through diode D2, and V2 is also received in the output of controllable current source E1, is used for the receiving circuit power supply to slave station; Because V2 is by the minimum steady current of clamper in the required electric current of battery terminal voltage much smaller than voltage stabilizing diode; When bus free time and main website transmission information; The electric current of controllable current source E1 can be little of the working current a little more than comparer in the receiving circuit; In the present embodiment, the quiescent current of controllable current source E1 is got 0.5mA.
Slave station is imported from TX_IN to the information that main website sends, and when TX_IN was high level, D4 turn-offed by, Q2, the electric current of current source (E1)=(2.5V-0.65V)/R2 ≌ 0.5mA (M-bus bus logic " 1 "); When TX_IN was low level, D4 conducting, Q2 were saturated, the ≈ 12.8mA (M-bus bus logic " 0 ") of the electric current of current source (E1)=(2.5V-0.65V)/(R2//R3).
In the slave station standby, receive under the information state, the steady current of controllable current source E1 about with 0.5mA is to carrying out online charging to battery B1; Send under the information state at slave, the pulse current that controllable current source E1 is that information is modulated with being sent out, peak value equals 12.8mA carries out online charging to battery B1.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.
Although this paper has used terms such as input circuit, controllable current source morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain the essence of the utility model more easily; It all is contrary with the utility model spirit being construed to any additional restriction to them.
Claims (5)
1. M-BUS bus slave station feed circuit is characterized in that, comprise input circuit, controllable current source, diode D2 and battery; The input end of said controllable current source is connected with the positive output end of said input circuit; The output terminal of said controllable current source connects the positive pole of diode D2, and the negative pole of said diode D2 connects the positive pole of battery, and the negative pole of said battery connects the negative output terminal of input circuit; The control end of said controllable current source is a data input pin; The negative output terminal of said input circuit is a common port, and the output terminal of said controllable current source is second voltage end, just very first voltage end of said battery.
2. M-BUS bus slave station feed circuit according to claim 1; It is characterized in that; Said controllable current source comprises resistance R 1, resistance R 2, resistance R 3, diode D3, diode D4, triode Q1 and triode Q2; Said resistance R 1 is connected between the collector and base stage of triode Q1, and the negative pole of said diode D3 connects the base stage of triode Q1; One end of said resistance R 2 connects the emitter of triode Q1, and the other end connects the positive pole of diode D3; Said resistance R 3 one ends connect the emitter of triode Q1, and the other end connects the emitter of triode Q2; The collector of said triode Q2 connects the positive pole of diode D3; The base stage of said triode Q2 connects the negative pole of diode D4; Just very second voltage end of said diode D3; The just very data input pin of said diode D4, the current collection of said triode Q1 is the input end of controllable current source very.
3. M-BUS bus slave station feed circuit according to claim 1 and 2 is characterized in that said battery is a rechargeable battery.
4. M-BUS bus slave station feed circuit according to claim 3 is characterized in that also comprise battery protecting circuit, said battery protecting circuit is parallelly connected with battery.
5. M-BUS bus slave station feed circuit according to claim 4 is characterized in that said battery protecting circuit is diode D5, and the positive pole of said diode D5 connects the negative pole of battery, and the negative pole of said diode D5 connects the positive pole of battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220153260 CN202615602U (en) | 2012-04-12 | 2012-04-12 | M-BUS slave-station power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220153260 CN202615602U (en) | 2012-04-12 | 2012-04-12 | M-BUS slave-station power supply circuit |
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| CN202615602U true CN202615602U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220153260 Expired - Fee Related CN202615602U (en) | 2012-04-12 | 2012-04-12 | M-BUS slave-station power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683118A (en) * | 2015-02-04 | 2015-06-03 | 合肥瑞纳表计有限公司 | MBUS (Meter Bus)-based power supply communication device and method |
-
2012
- 2012-04-12 CN CN 201220153260 patent/CN202615602U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683118A (en) * | 2015-02-04 | 2015-06-03 | 合肥瑞纳表计有限公司 | MBUS (Meter Bus)-based power supply communication device and method |
| CN104683118B (en) * | 2015-02-04 | 2017-11-14 | 合肥瑞纳表计有限公司 | Power supply communication device and method based on MBUS |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20140412 |